I want to calculate the average value of a raster file within each polygon boundary of my shapefile. Because I want to preserve area I wish to use the Goode Homolosine (Land) projection. The original shapefile has a geographic coordinate system WGS1984, and the original raster file is also in WGS1984.
I used the Project tool to project the shapefile to the Goode Homolosine (Land) projection, and the Project Raster tool for the raster file, also choosing Goode Homolosine (Land) as the projected coordinate system.
It is my understanding that because both of the original files have a defined coordinate system, i.e., WGS1984, I should not be using the Define Projection tool.
Problem: When I open the newly projected raster file in ArcMap, I receive the following error message:
Warning, inconsistent extent!
One or more of the added layers has an extent that is not consistent with the associated spatial reference information.
Re-projecting that data in such a layer may lead to unexpected behaviour
Two things to note:
- I do not receive this error message when I add the newly projected shapefile;
- This error message occurs even when I add the newly projected raster file to an empty data frame (which, if I understand correctly, should automatically determine the coordinate system for me).
I have just spent a considerable amount of time reading on how to re-project data and cannot see any problem in what I am doing.
Raster data: http://www.earth.columbia.edu/people/gmccord/sitefiles/file/malaria_ecology.zip Shapefile is not publicly available, but metadata states GCS_WGS_1984