Topology in arcgis. This tool is available in the Modify Features pane.

Topology in arcgis May 9, 2025 · Edit and validate subnetworks Clean subnetworks after editing and resolve subnetwork errors in a utility network. Adds a rule to a topology. But ask these same folks about how topology is handled in shapefiles and the nodding heads give way to shrugging shoulders. When asked if topology is a key concept of GIS, most GIS users will nod their heads in agreement. Sep 11, 2024 · Topology refers to the arrangement of how features share geometry in spatial data. Topology rules allow you to de ne those relationships between features in a single feature class or subtype or between two feature classes or subtypes. ArcGIS includes topology layers in the map that are used to display topological relationships, errors, and exceptions. These new features apply to both map and geodatabase topologies and allow you to choose how you visualize and interact with topology edges and nodes while editing in the map. Topology contiguity example Generating topology This section applies to ArcGIS Desktop Advanced only. Creating a topology using the Catalog window or ArcCatalog Here is the process The Topology toolset contains a set of tools that can be used to create and manage a geodatabase topology. This tool is available in the Modify Features pane. ArcGIS geoprocessing tool that fills gaps between polygon features that participate in a topology where the coincident boundaries are evident. Jun 9, 2021 · Are there any videos/demos/tutorials for working with various types of topology tools, workflows, etc. Topological edits are limited to visible layers that are editable. Jun 2, 2023 · For examples and solutions for all topology errors, read the articles in the Managing Topology with ArcGIS Utility Network series. I could really use an overview of the toolset and when to use map vs. This process will help minimize disruption and maintain network data accuracy The Move tool and Edit Vertices tool can select and move topological nodes when topological editing is turned on. Mar 6, 2024 · Use topology rules in ArcGIS: If you answer yes to any of the following questions, you should consider using GIS topology rules to check to validate and fix errors in your GIS data. TopoRuleID: This The document provides steps to correct topology errors in a geospatial dataset. Validate will cluster This video was created with ArcGIS Pro 3. xml file generated by the Export Topology tool in the Topographic Production toolbox. A copy is important because you will try to validate against your real data and see if your topology design works well. In ArcGIS Pro, topology allows users to implement integrity rules that ensure geospatial data meets standards of accuracy and consistency. See Topology basics and Topology in ArcGIS for conceptual information. Using a topology provides a mechanism to perform integrity checks on your data and helps you to validate and maintain better feature representations in your geodatabase. A parcel fabric is created with a geodatabase topology containing a set of default topology rules. The set of county polygons within each state must completely cover the state polygon and share edges with the state May 31, 2023 · Can ArcGIS Pro edit, using topology, multiple feature layers with identical geometry? ArcGIS geoprocessing tool to create a topology. Many geographic features share a common boundary; for example, ZIP Codes might follow street centerlines, shorelines share a border with oceans, and land parcels share an edge with neighboring lots. It has a longer time-out setting and is Jun 14, 2024 · I am using ArcGIS Pro 3. ArcGIS has a number of pathways for defining and creating a new topology. Gaps Gaps occur when adjacent parcel boundaries are not coincident and are separated from each other by a small distance. Topology rules allow you to define those relationships between features in a single feature class or subtype or between two feature classes or subtypes. You can use one Oct 12, 2010 · The following topics cover key concepts and ArcGIS support for topology. The Move tool can select and move a topological feature or a topological edge if Map Topology is turned on. Start editing. Using a topology provides a mechanism to perform integrity checks on your data and helps you to validate and maintain better feature representations in s geodatabase. Available with Standard or Advanced license. I also see CPU or RAM is stable during the validation and not hitting the roof Jul 19, 2025 · After establishing the topological rules, ArcGIS Pro automatically begins detecting errors. How often should you validate your topology? It is best to revalidate your topology after you have edited your feature 160196: Invalid TopologyThe topology of a feature was found to be invalid during processing. Tip: To isolate topological editing to layers participating in a geodatabase topology rule in the active map, choose the Geodatabase Topology rule that appears in the Map Topology drop-down list. Errors can be inspected and fixed to be removed the next time the network topology is validated. Change the display style The display style determines how elements of the topology graph are displayed and highlighted when topological ArcGIS® Geodatabase Topology Rules Topology in ESRI® ArcGIS® allows you to model spatial relationships between feature classes in a feature dataset. Like to Support us, Join the Channel Membship:more This topic applies to ArcGIS for Desktop Standard and ArcGIS for Desktop Advanced only. Both this tool and the Export Topology tool allow you to share and create topologies within different geodatabases. Geodatabase topology is the most efficient, automated, and thorough means of finding and fixing these errors. Apr 9, 2008 · See About topology editing for more information. 3 and trying to fix some polygon and polyline errors in a topology as identified by the error inspector tool. These topology rules define and enforce the topological relationships between parcel features. To add a topology layer—either new or existing—to a map, the user can use the “Add Data” button and select the previously created topology layer, which automatically includes the associated feature class layers. ? The only ones I've found are old (for ArcGIS Desktop) and the tool reference and help topics aren't clear to me. Topology options allow you customize the style and appearance of the topology graph and choose how the cluster tolerance is calculated. Topology is vital for ensuring that Summary Exports a topology from a geodatabase to an . Parcel fabric geodatabase topology In ArcGIS Pro, a parcel fabric is the only way to manage parcels. Turning on topological editing makes the graph available to editing tools and shows an Edges tab on tools that can perform both feature and topological edits. operates on all features. For example, the rule Must not overlap is used to manage the integrity of features in the same feature class. Each subtype may have different connectivity, relationship, or topology rules associated with it. Whenever you move data between models, there is always a risk of introducing errors that impact data quality. Define valid spatial relationships Between feature classes or subtypes 25 25 rules rules available available (C:\Program (C:\Program Files\ArcGIS\Documentation\topology Files \ArcGIS\Documentation\topology_rules_poster. Topology options are available in the Editor Settings dialog box. The primary method involves the use of tools in the Catalog window or ArcCatalog. Creating or editing geodatabase topology requires an ArcGIS Desktop Standard or ArcGIS Desktop Advanced license. To move a topological node The primary method for creating a new topology in ArcGIS Pro is the Create Topology wizard. It is easy to create a map topology Prepare for publishing When you publish and consume a topology as part of a web feature layer, conditions and prerequisites apply. The universe polygon ensures that each arc always has a left and right side defined. xml file contains a definition of a topology, including feature class names, topology ranks, topology rules, and cluster tolerance. xml file. Also, add the topology you want to edit. Apr 14, 2023 · Topology in ArcGIS Pro is the arrangement that defines how point, line, and polygon features share coincident geometry. If you have features that are coincident and share the same location of coordinates, boundaries, or nodes, geodatabase topology can help you better manage your geographic data. Validate will cluster Learn how to identify and fix topology errors in ArcGIS. Overlaps Overlaps occur when adjacent parcel boundaries are not coincident and the parcels overlap each other by a small area. There are two basic types of topological methods from which to choose: topological editing and geodatabase topology. If the feature class you are adding is z-aware, you can rank the relative accuracy of the feature class by elevation by setting the z rank for the feature class. ArcGIS geoprocessing tool that validates a geodatabase topology. The workflow consists of defining a rule, validating the features, fixing errors, and marking exceptions. Geodatabase topologies help ensure data integrity. 1 (and before as well) with "Validate Network Topology" tool. Topologies are collections of one or more feature classes in a geodatabase feature dataset, with rules governing how point, line, and polygon features share coincident geometry. In ArcGIS Pro, topology refers to a specific set of tools and methods for defining spatial relationships between point, line, and polygon features, and maintaining those relationships as features are created or modified. Examples of topology rules include "Must Not Have Gaps" for polygons, "Must Not Overlap" for polygons, and "Must Be Covered By Feature Class Of" for areas. There are two types of topology in ArcGIS Pro: topological editing and geodatabase topology. We discuss the Note: Starting with ArcGIS Enterprise 10. In ArcGIS, topology includes Topology in ArcGIS Pro is the arrangement that defines how point, line, and polygon features share coincident geometry. Topology rules Topology rules define the permissible spatial relationships between features. This tutorial covers common topology issues like gaps, overlaps, and dangles, and demonstrates how t For example, a versioned feature class can be added to a versioned topology, but a nonversioned feature class cannot be added to a versioned topology. 3. They share this edge. Use the Move tool Use the Move tool Edges tab to select and move coincident topological nodes and stretch all connected edges. Addressing topology is more than providing a data storage mechanism. The steps include: 1) importing a feature class into a new geodatabase and feature dataset; 2) building a topology on the dataset; 3) using the topology toolbar to search for and inspect errors, such as gaps or overlaps between features; and 4) correcting the errors by merging or creating new features. 8In the video I:- Create an empty Feature Dataset- Import some polygons (feature class) into th Learn how to maintain spatial integrity and ensure high-quality data in ArcGIS Pro using geodatabase topology! In this video, we cover: Setting up geodataba It provides examples of topological rules and explains how Esri's ArcGIS software is used to create, validate, and fix topology errors in GIS vector data. The errors were generic errors like "ERROR: General function failure","ERROR", "ERROR:FDO" etc. In addition, topologies can be used for modeling numerous spatial relationships Prepare for publishing When you publish and consume a topology as part of a web feature layer, conditions and prerequisites apply. Summary Validates a geodatabase topology. In addition, topologies can be used for modeling numerous spatial relationships Available with Standard or Advanced license. ArcGIS Geodatabase Topology Rules Topology in Esri® ArcGIS® allows you to model spatial relationships between feature classes in a feature dataset. 8. Jul 19, 2025 · In GIS, topology refers to the rules and spatial relationships that define how geographic features interact with one another. Once you know how to create a topology, you can automate this work using a suite of geoprocessing tools. In ArcGIS, topology Video #107This is an introduction to topology in ArcGIS Pro 2. Do you have GIS questions or video topic requests? Available with Standard or Advanced license. A map topology creates topological relationships between the parts of features that are coincident, which allows you to simultaneously edit features that share geometry. This month’s workshop introduced the concepts of topology and reviewed how it is implemented in ArcGIS Pro. The network topology is initially enabled once a utility network is configured and ready for use. List the feature classes that will share geometry and Apr 28, 2025 · In ArcGIS Pro, topology is managed through geodatabase (including File Geodatabases) topology, which allows you to define rules that reflect the requirements of your data. Summary Creates a topology. In this video, we’ll guide you through the process of creating and working with Topology in ArcGIS. However, recent patch UN Patch 4 for v10. The UtilityNetworkTools service is preconfigured in the System folder for feature services that include a utility network. ArcGIS: Working With Geodatabase Topology Topology—the spatial relationship between geographic features—is fundamental to ensuring data quality. Errors are generated by the system when a network feature in the utility network is in violation of established rules and restrictions. Jul 8, 2025 · Configure rules for a utility network Use a utility network to resolve topology errors by changing rules, terminal configurations, and edge connectivity. Create customized rules between features using written The Error Inspector contains a list of topology errors and violated rules, the feature class or classes involved in the errors, the geometry of the errors, and the The Topology toolset contains a set of tools that can be used to create and manage a geodatabase topology. The following tips can help you when using geodatabase topologies. Oct 12, 2010 · See About topology editing for more information. Geodatabase topology rules define the permissible spatial relationships between specific feature geometry in different feature classes, or between subtypes of features. The features can be in one or more layers and have different layer types. how to apply geodatabase topology to remove or check errors in shapefileIn geodatabases, topology is the arrangement that defines how point, line, and polygo Once you have created a topology and loaded data, you can run a validation against the feature class contents of the topology. This topic explains the topology rules available for polygon features and their predefined fixes. 1, the enable network topology operation will process asynchronously using the UtilityNetworkTools geoprocessing service when working with a utility network in an enterprise geodatabase. What is map topology Arcgis pro? Map Topology. Learn how to use the ArcGIS Utility Network to edit and validate network connectivity using a topology and rules to ensure your network data is valid. As of ArcGIS Pro 3. The process of building a topology from existing data can be summarized in the following steps: Nov 17, 2020 · I had some issues in 10. Increase the performance of the geodatabase by representing a variety of real-world objects as a subset of features in a given feature class instead of creating feature classes for each object. Make a list of the desired feature classes that will share geometry. Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. The rules you choose to add depend on the spatial relationships that you wish to monitor for the feature classes that participate in the topology. Topology rules define the permissible spatial relationships between features. Topology is a key concept in GIS that helps maintain the spatial relationships between Section 2: Identifying Topology Errors To begin correcting topology errors, we first need to identify them. In ArcGIS, topology includes all the following aspects: The geodatabase ArcGIS Geodatabase Topology Rules Topology in Esri® ArcGIS® allows you to model spatial relationships between feature classes in a feature dataset. Using a topology provides a mechanism to perform integrity checks on your data and helps you to validate and maintain better feature The Edit Vertices tool can change shared topological edges to a line, a circular arc, or a Bezier curve when topological editing is turned on. Choosing a geodatabase topology rule limits topological editing to features participating in the selected rule. Create a topology using the Create Topology wizard To create a topology using the Create Topology wizard, complete the following steps: In the Catalog ArcGIS Desktop is in mature support and will be retired March 1, 2026. Geodatabase topologies help you ensure data integrity. Topology in ESRI® ArcGIS® allows you to model spatial relationships between feature classes in a feature dataset. Topology enables advanced spatial analysis and plays a fundamental role in ensuring the quality of a geographic information system (GIS) database. The August 2020 ArcGIS Pro Workshop focused on using topology in ArcGIS Pro, including creating topology rules, validating topology, identifying and correcting topology errors. us - Meet your GIS Company where quality matters. zip file containing a sample case of using a geoprocessing model and Python script to import CAD lines, perform data cleanup, and implement geodatabase topology. - Download as a PDF, PPTX or view online for free Oct 12, 2010 · See About topology editing for more information. 1, you can add rules to a versioned topology when the ArcSDE geodatabase is version 10. Summary Creates a geodatabase topology from a definition . If Map Topology is turned on, you can move, delete, or add a topological vertex and preserve the connectedness of shared boundaries. ArcGIS Topology Fundamentally, topology is used to manage how a set of simple feature classes share geometry With an ArcGIS Desktop Standard or ArcGIS Desktop Advanced license, you can set up a geodatabase topology. In ArcGIS Pro, there are several tools and methods we can use to do this. Map Topology is an editing mode for working with topologically connected edges, vertices, and intersections. This topic explains the topology rules available for polyline features and their predefined fixes. Why should GIS users care about topology? What are the advantages and disadvantages of storing polygon data in shapefiles rather than coverages? What Is Topology? In 1736 ArcGIS geoprocessing tool that validates a geodatabase topology. They also cover a number of common workflows for building and using topologies in ArcGIS. If you have features that are coincident and share the same location of coordinates, boundaries, or nodes, chances are that geodatabase topology can help you better manage your geographic data. To select coincident nodes, press N while dragging the selection tool. Enable a network topology to work with dirty areas, tracing, and network diagrams To work with dirty areas, run traces, and generate a diagram, the network topology must be enabled on a utility network. 1, including adding a rule, using the error inspector, and fixing a topological error. Welcome to GIS Gallery! In this tutorial, we’ll explore topology in ArcGIS Pro, a fundamental tool for maintaining spatial data accuracy and integrity. Specify the spatial representations of each feature class (point, line, or polygon). Brief demo of creating topology in a file geodatabase using ArcMap 10. I can preview errors and can see what types of editing options are available to fix the error - Create Feature, Merge, etc. A short video on topology Courtesy of Tessellations Inc. It has a longer time-out setting and is . The primary method for creating a new topology in ArcGIS Pro is the Create Topology wizard. Here is the general topology editing process: Start ArcMap and add map layers for the feature classes in your topology that you want to edit. The General tab on the Coverage Properties dialog box shows which feature classes have topology. 0 or later. If the same feature is edited in two separate versions and those versions are reconciled, they will be in conflict. xml file contains a definition of a topology, including feature class names, topology ranks, topology rules, and cluster tolerance, and can be used by the Import Topology tool to recreate a topology in a new feature dataset. pdf) rules poster pdf) Many rules for each type of feature (point, line, polygon) Set when creating topology; tested during Hello, in today's video I will show you how to use Topology in ArcGIS Pro 🔥In geodatabases, topology is the arrangement that defines how point, line, and po A map topology creates topological relationships between the parts of features that are coincident, which allows you to simultaneously edit features that share geometry. If you have a dataset with a lot of errors, download the Utility Data Management Support Tools and run the SummarizeUNErrors tool to generate reports to help prioritize data cleanup. Parcel boundaries that should If you have a geodatabase topology in your table of contents (and ArcGIS Desktop Standard or ArcGIS Desktop Advanced license), you can edit shared features using geodatabase topology. ArcGIS implements topology through a set of rules that define how features may share a geographic space and a set of editing tools that work with features that share geometry in an integrated fashion. 1 for Desktop, rules could not be added to a versioned topology. 4, tools that support topological editing include Align Edge, Edit Vertices, Move, and Reshape. The . This workshop was intended to be a general primer on topology and discuss planning Oct 12, 2010 · Note: This topic was updated for 9. Using a topology provides a mechanism to perform integrity checks on your data and helps you validate and maintain better feature representations in your geodatabase Features that participate in topology do not have any special behavior with respect to conflicts resulting from version reconciliation. Jan 9, 2012 · A . In geodatabases, topology is the arrangement that defines how point, line, and polygon features share coincident geometry. In Geodatabases, topology is the arrangement that defines how point, line, and polygon features share coincident geometry. In ArcGIS Pro, it is implemented as a collection of spatial rules that are used to constrain active edits or audit and maintain the correctness of features based on their position relative to other features. 1 seem to have fixed these issues and has improved the speed of the validation as well. ArcMap contains a number of advanced tools and functions for managing and editing a topology. Topology errors are The Topology Properties dialog box provides access to the status, feature classes, and rules associated with a topology. Move a topological edge Use the Edges tab to select and move a topological edge and preserve its direction and length. When you validate your topology, ArcGIS will automatically know the dirty areas that have to be validated. You can work through several design steps prior to developing a topology design before you use ArcGIS to create a topology in the geodatabase. In ArcGIS, it plays a critical role in maintaining data accuracy and consistency by managing the spatial relationships between features. Use the Add Feature Class To Topology and the Add Rule To Topology tools to add feature classes and rules to the topology. A GIS topology is a set of rules and behaviors that model how points, lines, and polygons share coincident geometry. For example, street centerlines and census blocks share common geometry, and Topology is a collection of rules that, coupled with a set of editing tools and techniques, enables the geodatabase to more accurately model geometric relationships. To upgrade your geodatabase, use the Upgrade_Geodatabase tool. To learn more about map topology, see Map topology. The primary method involves the use of topology tool discussed in the video. Topology rules allow you to define the spatial relationships that meet the needs of your data model. The ArcGIS developer tools provide programmers with access to the topology graph, which is a planar representation of the geometries in the feature classes participating in a topology. In this workflow, you will use the utility network topology to assess and enhance the data quality and address errors. 3) Topology describes the way interrelated features are organized and connected. Topologies provide Map Topology is an editing mode for working with topologically connected edges, vertices, and intersections. 4. The validation process performs the following tasks: Cracks and clusters feature vertices to find features that share geometry (common coordinates) Inserts common coordinate vertices into features that share geometry Runs a set of integrity checks to identify any Available with Standard or Advanced license. You can apply Must Not Overlap and Must Not Have Gaps rules to find polygons that either overlap each other or have gaps between The Edit Vertices tool can make simple edits to topologically connected vertices. geodatabase t Jun 8, 2010 · This topic applies to ArcEditor and ArcInfo only. ArcGIS also includes a set of tools for query, editing, validation, and error correction of topologies. These alternative methods are described in this section. Follow these step-by-step directions to create a map topology in ArcGIS that can help you maintain coincident features. Hands-on experience with geodatabase topologies (ArcGIS Pro 1. As of ArcGIS 10. Topology rules define the spatial relationships that must be maintained between features in a geodatabase. Geodatabase topology comprises a collection of spatial rules that you can use to define relationships between features in a dataset. Mar 4, 2025 · In the Analyzing topology errors article we showed you how you can use the new Analyze Network Data tool to identify topology errors in your utility network data. Proposed topology design testing Use a file or mobile geodatabase with a copy of your feature class data to test your topology design. Prior to ArcGIS 10. 1. A utility network has a single network topology that manages connectivity between network features and caches information to be consumed by analytics operations (tracing and diagrams). This tool performs the following operations: Cracking and clustering of feature vertices to find features that share geometry (have common coordinates) Inserting common coordinate vertices into features that share geometry Running a set of integrity checks to identify any violations of the Geodatabase topology rules allow you to define relationships between features in the same feature class or subtype or between two feature classes or subtypes. An ArcGIS Desktop Standard or ArcGIS Desktop Advanced license is required to create, edit, or validate geodatabase topology. ArcGIS geoprocessing tool that exports errors and exceptions from a geodatabase topology to the target geodatabase. It is easy to create a map topology ArcGIS Geodatabase Topology Rules Topology in Esri® ArcGIS® allows you to model spatial relationships between feature classes in a feature dataset. Solutions to resolve various types of topology errors are described. A topology is stored in a Using a topology provides a mechanism to perform integrity checks on your data and helps you to validate and maintain better feature representations in your geodatabase. If two features overlap ArcGIS geoprocessing tool to create a topology. ArcGIS geoprocessing tool that validates features with dirty areas in the network topology of a utility network after edits have been made. Addressing topology is more than providing a data Jun 19, 2025 · Geodatabase Topology in ArcGIS Pro Topology refers to the spatial relationships and rules that define how features - like points, lines, and polygons- interact with each other. Topologically connected edges stretch and remain connected. The Validate Topology tool performs the following operations: Cracking and clustering of feature vertices to find features that share geometry (have common coordinates) Inserting common coordinate vertices into features that share geometry Running a set of integrity checks to identify any ArcGIS will automatically track dirty areas for you as you edit your data and if you change your topology definition. For example, street centerlines and census blocks share common geometry, and adjacent soil polygons share their common boundaries. Before you add the topology and the feature classes that participate in the topology to the map, follow the steps below to ensure that the data meets these requirements and to prepare your environment for the publishing process. 9. In this exercise, you will create a simple geodatabase topology rule to help you find digitizing errors in lot line data that has been imported from CAD, then use the topology and editing tools to fix these errors. The ArcGIS developer tools provide access to the topology graph, which is a planar representation of the geometries in the feature classes participating in a topology. This tool performs the following operations: Cracking and clustering of feature vertices to find features that share geometry (have common coordinates) Inserting common coordinate vertices into features that share geometry Running a set of integrity checks to identify any violations of the Jan 2, 2025 · From the Esri Support site: TopoRuleType: This field specifies the type of topology rule that is being applied. To move a topological edge, complete the following steps: The Topology Rules check allows you to validate a topology against the rules that have been defined, and then review the results by browsing the features or writing them to the Reviewer table. See Migrate from ArcMap to ArcGIS Pro for more information. Data integrity directly affects the performance and reliability of a utility network. In ArcGIS, topology includes You can create simple, temporary topological relationships between features in ArcGIS Desktop Basic. The topology will not contain any feature classes or rules. The rules you define for a topology control the relationships between features within a feature class, between features in different feature classes, or between subtypes of features. These tools are available in the Modify Features pane. Using a topology provides a mechanism to perform integrity checks on data and helps validate and maintain better feature representations in a geodatabase. Parcel boundaries that should be coincident are separated by a small gap. , visit us at http://tessellations. Once all Mar 4, 2017 · Subscribed 111 31K views 7 years ago create topology in ArcGIS, how to create topology in ArcGIS, creating topologymore 4 days ago · This white paper discusses the definition of topology as it applies to maintaining data within ArcGIS, how topology works within a geodatabase, and how to incorporate topology in your workflow. In addition, topologies can be used for modeling numerous spatial relationships Do Topology Analysis using ArcGIS, find the Error while digitizing the road, river or any network and rectify error. Topology is a collection of rules that, coupled with a set of editing tools and techniques, enables the Geodatabase to more accurately model geometric relationships. You can create a map topology for point, line, or polygon layers from shapefiles or geodatabase feature classes. The Topology toolset contains a set of tools that can be used to create and manage a geodatabase topology. Note: Starting with ArcGIS Enterprise 10. There are no plans for future releases of ArcGIS Desktop, and it is recommended that you migrate to ArcGIS Pro. Use geodatabase topology for ecomobility Establish geodatabase topology rules to review and ensure your data's accuracy. For example: Adjacent features, such as two counties, will have a common boundary between them. ArcGIS Desktop is in mature support and will be retired March 1, 2026. 1, the disable network topology operation will process asynchronously using the UtilityNetworkTools geoprocessing service when working with a utility network in an enterprise geodatabase. uspuiw botokc bgdkwn yeav tgtvwf nvs djxfjw enz san myiywe fnbqcynp zgwedj yqlfr iisc yxyhoa