I am creating a map and I need to tell ArcGIS that each pixel is 135 meters across so that I can take some measurements. To be more specific, I have an image taken by a spacecraft of another planet's terrain. I basically need to tell ArcGIS what the resolution of the image is. How do I do this? Thanks in advance!
Okay so I measured the image with the measure tool and it said that it was 735 by 680 meters and the image is 735 by 680 PIXELS when I look at the image properties and I double checked with NASA's JPL website. So I think that Arc is already measuring in pixels, it's just saying that it's in meters. So now I should just have to measure the shadow which will give me the number of pixels and then subsequently multiply that number by 135 meters/pixel to get the height of the scarp. I think I've got it figured out. Thanks for your help. (P.S. let me know if I am way off!)