How can I find in ArcGIS 10.1 the value of a pixel on a map (raster) at different scales? For example, 1: 550,000 and 1: 600,000. What are the steps I need to follow to find out the value of a pixel?
I have attached a sugestive map.
If I understand your question correctly you're looking to get the pixel value not the cell size. Assuming that's the case the pixel value of the raster does not change by changing the scale you display it at. There are two straightforward ways to get the value. First, use the "Identify" icon on the menu. Clicking on any portion of the raster will open a window that will allow you to select the layer that you're interested in. Once selected click away. Second, there is a tool in Data Management Tools-->Raster-->Raster Properties called Get Cell Value...
The pixel value is the same regardless of scale. It shows you the pyramids but the value will always be from the original raster. You are mixing resolution and scale. Just use the Identify button and click on the pixel. If you want to change the resolution use the resample tool
To see all values available in your grid open the attribut table of the raster.
To know the value of a specific pixel you can use Identify option on the Tools bar. Whether attribute table of the raster map will give you the pixel values of the entire map.
You can either find attribute table or else use identify tool.Right click on the identify tool and again right click on the raster you will get a window with pixel value at that particular point.
I agree with Stuart, the pixel value is the same regardless of scale. You'd need to resample the cell resolution to be reflective of different scales to get change in values.
You can click on identify button for single pixel values. otherwise got to customize>customize mode>commands>raster>pixel inspector
add pixel inspector to your tool bar for getting pixel values fro larger areas.
If there is a specific value you want to find on the map, you could run a reclassify to create a new raster that only has that value and no data (or 0 or some other value) for everything else. Otherwise, as suggested before, the Identify tool.
In addition to the above suggestions:
If you have a specific location that you want to know the value for in a corresponding raster, use the "extract values" tools in ArcToolbox. Similar options are available for points or polygons. This requires a Spatial Analyst extension to be licensed.
Jolks answer only works for integer data.
Vinings answer woks well if you have points of locations you want to extract data for.
Babu works well for pixel regions.
Sarkar works well for the odd point, you do not want to do 1000 this way.
Remember the pixel value is the pixel value regardless of scale.
You can to do right click on the file in the table of contents, click properties, click Source and read Cellsize (X, Y) for the value of the pixel...
Dear Ana Maria
It's easy: you click on the file in the table of contents after u click properties, Source and read Cellsize (X, Y) for the value of pixel.
Best regards
If I understand your question correctly you're looking to get the pixel value not the cell size. Assuming that's the case the pixel value of the raster does not change by changing the scale you display it at. There are two straightforward ways to get the value. First, use the "Identify" icon on the menu. Clicking on any portion of the raster will open a window that will allow you to select the layer that you're interested in. Once selected click away. Second, there is a tool in Data Management Tools-->Raster-->Raster Properties called Get Cell Value...
Also you can create a point layer, next with Extract Values you can get the value of a pixel in a table.
if you want to convert it to ASCII, you could use conversion toolbox in arc catalog
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