calculating raster summary stats/pojection requirements

SkidWitt — Mon, 10 Nov 2014 23:02:34 GMT

I have downloaded the ArcMap online ‘World Administrative Divisions’ polygon layer, and then projected it into World_Behrmann. so my data frame properties are set at:

World_Behrmann

WKID: 54017 Authority: ESRI

Projection: Behrmann

False_Easting: 0.0

False_Northing: 0.0

Central_Meridian: 0.0

Linear Unit: Meter (1.0)

Geographic Coordinate System: GCS_WGS_1984

Angular Unit: Degree (0.0174532925199433)

Prime Meridian: Greenwich (0.0)

Datum: D_WGS_1984

Spheroid: WGS_1984

Semimajor Axis: 6378137.0

Semiminor Axis: 6356752.314245179

Inverse Flattening: 298.257223563

I then downloaded some of the WorldClim raster layers, i.e. altitude and annual temperature etc. Initially I just ran the ‘Zonal Statistics as Table’ tool to summarise the altitude raster data by country and state levels defined by the World Admin polygon layer, but I’m just wondering whether I need to separately project the raster data to World_Behrmann first before running this tool, or if it shouldn’t matter if ArcMap runs the projection on the fly?

Any advice will be greatly appreciated.

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calculating raster summary stats/pojection requirements