How to fetch the MOM Json files for Indoor Maps using platform UI

Download MOM JSON for a HERE Indoor Map from HERE platform UI
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If you need the Map Object Model, or MOM, JSON for a HERE Indoor Map, download the raw partition data from the Indoor Map Models versioned layer in the HERE platform Data catalog, then decompress the downloaded Gzip file before using it. This behavior is expected: the Indoor Map Models layer stores indoor map model data as compressed raw partition data, so the downloaded file is not directly readable as JSON until it is uncompressed.

Customer symptoms
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Customers may search for this article when they experience one or more of the following symptoms:

“I need to export HERE Indoor Map data as MOM JSON.”
“I cannot find the MOM file for my Indoor Map in the HERE platform UI.”
“The downloaded Indoor Map file is not readable JSON.”
“The Indoor Map Models partition download looks compressed or binary.”
“I do not know which partition ID contains my Indoor Map UUID.”
“I need OAuth2 credentials to access Indoor Map data through HERE platform.”

Applies to
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Product: HERE Indoor Maps
Platform: HERE platform
Component: Data catalog, Indoor Map Models versioned layer, Platform Data API
Data format: Map Object Model, MOM
Access method: HERE platform UI
Authentication: HERE platform application OAuth2 credentials

Behavior classification
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Expected behavior.

The HERE platform stores Indoor Map MOM data in the Indoor Map Models versioned layer. The raw partition data is downloaded from the Data catalog and is Gzip compressed. After download, the file must be decompressed before the MOM JSON can be opened or processed.

Root cause
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The downloaded file is not immediately readable as JSON because the Indoor Map Models layer provides the raw indoor map model partition data in compressed form. A user also needs access to the correct Indoor Maps catalog and the correct partition ID, which includes the Indoor Map UUID. If the user cannot find or download the partition, the most common causes are missing catalog permissions, missing application credentials, or selecting the wrong layer or partition.

Impact
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Without the correct access rights and partition selection, users cannot retrieve the MOM JSON for a specific Indoor Map from the HERE platform UI. If the downloaded file is not decompressed, tools or editors may show unreadable content instead of valid JSON. This can block validation, troubleshooting, data inspection, or downstream processing of HERE Indoor Map data.

Recommended action
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Use the HERE platform UI to locate the Indoor Map Models versioned layer, download the raw data for the partition that contains the required Indoor Map UUID, and decompress the downloaded Gzip file before opening or processing the MOM JSON.

Procedure
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### 1. Confirm access and credentials

1. Sign in to the HERE platform with a HERE account that has access to the Indoor Maps project.
2. Open Access Manager from the launcher.
3. Select the Apps tab.
4. Select Show all apps.
5. Locate the Default Map Collection App.
6. Create or use OAuth2 credentials for the application. The user must have the required organization administration and application management rights.
7. Download and store the credentials securely. The platform does not allow the same credential secret to be downloaded again after creation.
8. Confirm that the application has read access to the main Indoor Maps catalog.

The OAuth2 credentials are used when accessing the same data through Platform Data API or command-line workflows. For UI-based download, the signed-in user must still have access to the relevant catalog and project.

### 2. Open the Data catalog in HERE platform

1. Sign in to the HERE platform.
2. Open the launcher.
3. Select Data



### 3. Find the Indoor Maps catalog

1. In the Data catalog search field, search for-maps or search for the Indoor Maps catalog name used by the project.
2. Select the relevant Indoor maps catalog.



### 4. Select the Indoor Map Models layer

1. In the catalog, locate the list of layers.
2. Select Indoor Map Models.
3. Confirm that the selected layer type is Versioned.



### 5. Download the MOM partition

1. Open the Inspect tab.
2. Locate the partition for the required Indoor Map.
3. Use the Indoor Map UUID to identify the correct partition ID. The Indoor Map UUID is available in the Indoor portal and is also included as part of the partition ID.
4. Select the required partition.
5. Download the raw data for that partition.



### 6. Decompress the downloaded file

After downloading the raw partition data, decompress the Gzip file before opening it. The decompressed output contains the MOM JSON for the selected Indoor Map.

Additional notes
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The Platform Data API can also be used to retrieve Indoor Map data programmatically. Use the UI workflow above when the goal is to manually inspect or download the MOM partition from the HERE platform Data catalog. Use an API or CLI workflow when automation, repeatability, or integration into a data pipeline is required.