Help / Q&A


ArcGIS Pro Layer files available for highlighting vegetation gain or loss with HazMapper data:

Veg. Loss layer file (*.lyrx, download)

Veg. Gain layer file (*.lyrx, download)

Questions & Answers… Have a question? Please e-mail us.

Q: After an event happens, how long do I have to wait for post-event imagery? A: For the Sentinel-2 A/B satellites, the repeat cycle is 10 days for each satellite or 5 days when combined. Depending upon the time elapsed since the Sentinel-2 satellites passed over your area of interest, it could be as short as a one day wait. The Landsat 7 & 8 satellites have a repeat cycle of 16 days. Of course, if the area is cloudy when the satellite passes over, the acquired scene may not be that useful, and you will have to wait for additional image acquisitions.

Sentinel-2 Acquisition Plans

Landsat 7 & 8 Acquisition Plans

Q: Why does HazMapper not seem to work for high latitude regions? A: It does, but if you are trying to use it for locations above 60° N or 56° S latitude, and you input a Slope threshold (deg) value in the Parameters window, HazMapper will fail to return any of the output image files (Hillshade, Greenest Pre, Greenest Post, or Relative NDVI change). This is because the slope threshold depends on the existence of the SRTM-30 m DEM for the location that you are analyzing, and this DEM does not extend above 60° N or 56° S latitude. HazMapper stops processing when it can not execute an input slope threshold value because the underlying DEM does not exist. To fix this, simply delete the Slope threshold value from the Parameters window and press the Update button. HazMapper will happily get back to work.

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