Alaska Mapped can ingest most data formats. However, to be able to successfully read and geo-locate the data in our services the data itself or associated metadata needs to provide some fundamental things:

• Projection
• Datum
• a well defined no-data value
• Extents if not included in the data format (e.g., world file)

We prefer to receive data in the following formats for ease of ingestion:

• GeoTIFF
• ERDAS Image File (HFA)

However, we will happy to accept data in any geo-referenced format.

Additionally for DEM data, we need to know:

• the vertical units: feet or meters
• the horizontal and vertical datums
• the geoid model
• whether the data is ellipsoid or orthometric heights