I know this is a very elementary question so please excuse what might sound so simple. I am trying to calculate the total area of a raster dataset that has a specified Cell Size of 1 m. I used IDW to interpolate carbon lbs/per area and I???m confused as to how to understand the Raster properties. I can see how many Columns and Rows there are and I know that the inputs are in UTM and I also see the No Data values but I???m unclear as to how to understand all of this. I???ve read and re-read the Help articles and remain just as confused. I see the Extents but I think these numbers correspond the geographic location of the data, not the size of the area. I also used the Zonal Stats tool to Sum the amount of Carbon in the study area and the table shows Count, Area and Sum but I don???t know how to interpret these.

Any help is greatly appreciated.

Thankyou!

Natasha

[ATTACH=CONFIG]27364[/ATTACH]

Any help is greatly appreciated.

Thankyou!

Natasha

[ATTACH=CONFIG]27364[/ATTACH]

Have you read this section of the help? You really need a handle on these concepts to work with raster data effectively -- so if you haven't read this overview yet I highly recommend it to you:

ArcGIS 10.0 help: What is Raster Data?

You seem to have a start as the extents are the extent of the dataset, which includes all cells, those with data and cells that are NoData.

Count is the number of data cells found in that zone, Area is the total area (count times the square of the cell size used in the calculation), and Sum is the sum of the values data cells in the zone. The online help for Zonal Statistics as Table has an example that shows this pretty clearly.

You may be wrong about the cell size though -- you said the raster dataset has a cell size of 1m but your screen shot shows a cell size of 0.87.

Hope this helps.