resize image resolution from 1000 m to 250 m

Question

I'm beginner of ARCGIS and RS. I have many problems with the procedure. One of them is
I have NDVI images and Soil map. Both are at the different resolution: NDVI is 250 m. soil map is 1000 m. So I wanna ask how can I change the resolution from 1000 m to 250 m.

Thanks a lot

Answer 1

The operative word is Resample, the version link is provided, similar links exist for prior versions of Arcmap. Also be aware of resampling issues associated with the resampling method and the nature of the data being assessed.

EDIT If you want to go the reverse route (ie decrease resolution) see Aggregate or Resample but be careful to choose your options based upon your input data type.

Answer 2

I would like to add Block Statistics as another method to alter the resolution of a raster. Depending upon your specific goals, Block Statistics allows fine control of how pixels are assigned based on:

• A user defined neighborhood (e.g. rectangle, circle, wedge etc)
• The type of statistics calculated within each block (e.g. mean, majority, variety etc).

In this example, pixel values are assigned based on a 3 X 3 rectangular window using "maximum" statistics.

Answer 3

Import image, define projection and export with lower resolution.

1. Open an empty Project in ArcGis.

   a. Click on the following icon:
   

2. Define datum.

   a. Click with mouse right button at the word “Layers”:
   

   b. Select “Properties”.
   

   c. Go to the field “Select a Coordinate System” and choose as from option list, the desired geographic coordinate system and datum to be applied to data. Click “Ok”.
   

3. Open an image of interest.

   a. Click on the following icon:
   

   b. Choose file which correspond the image of interest and click “Add”.
   

4. Export the image at lower resolution.

   a. Click with mouse right button on the image to be exported, select “Data”, and then, select “Export data”.
   

   b. Define the new pixel resolution:
   Remark: always keep equal pixel dimensions (example given; go through 250 m x 250 m to 1000 x 1000 m.

   c. Define local, name and extension type of the file that will be created.
   

   d. Check if image’s properties are in agreement with what was expected.
   

   e. Click on “Save”.

   Any revision/edition toward improvements will be gladly accepted.