[GIS] Make all pixel in raster have the same value

arcgis-desktoparcmaprasterraster-calculator

I have a raster file with two categories: category 12 (total count=350) and category 14 (total county = 500). The attribute table looks like this:

rowid Value Count
 0     12     350
 1     14     500

Is there any way I can give all pixel a value of 1?

Best Answer

Have a look at the Reclassify tool (Spatial Analyst).

Related Solutions

[GIS] How to change the class of one pixel in a classified image

The simplest way is to create a new point layer for identifying individual cells which have been misclassified: for each incorrect cell, create a point at that location, and update the attribute table with the corrected value.

Then, rasterize the points to a layer with the same extent and cell size as your input layer, then merge the two with a raster calculator, doing something along the lines of:

if(rasterized_points > 0, rasterized_points, classified_input_image)

[GIS] Getting all the Raster pixel value from PostGIS

You imported the raster as tiled and then each tile is getting its own row into the raster table and also an unique primary key value into the "rid" column.

Your query returns all the pixel values from the tile 2 of your raster. You should see that from the number of returned rows that is 100x100=10000. If you want to get values from all the pixels of the whole raster with one query you can either

1) Import data without tiling. Then you'll get just one row into the raster table. I assume it will have rid=1 but you can check that from your database.

2) Import data as tiled but instead of rid use filenamein the query.

WHERE filename='raster_table'...

Notice that the number of rows may be hard to handle: million rows for a raster with just 1000 x 1000 pixels.

Best Answer

Related Solutions

[GIS] How to change the class of one pixel in a classified image

[GIS] Getting all the Raster pixel value from PostGIS

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