Changing the values of the cells in a raster.
1
vote
1answer
50 views
Global DEM and country borders
I am trying to split up the world into 2 categories based on elevation (below 2000m and above 2000m) while still including a country identifier. So in the end, I would like to have 2 types of units ...
0
votes
1answer
118 views
How do you use 'reclass' in GRASS?
It could be user error, but for some reason, the reclass tool is just hanging and hanging...
QGIS 1.8
Compiled against GDAL/OGR 1.9.2
Ubuntu 12.04.1
Running the tool from the Sextante toolbox
Input ...
2
votes
0answers
190 views
Reclassifying a field in vector files in ArcGIS [duplicate]
ArcGIS has a reclassify tool that works with Raster files only.
Is it possible to have the same functionality for a vector file?
On the basis of one of the fields in a feature class, the tool ...
1
vote
0answers
61 views
Reclassifying a raster based on values in another raster
I am attempting to create a new raster based on the values of two rasters I have already created. I am using ArcGIS 10.1
Raster1 is an area with my true values.
Raster2 was created by reclassifying ...
1
vote
1answer
45 views
Tables within the Reclassify tool- what is it, where is it?
ArcMap 10.1 here. I have a raster set I'm looking to reclassify. The field I need to re-classify is currently a string of words like "Thing 1" and "Thing 2" and I'm going to set them to be 1 and 2.
I ...
2
votes
1answer
128 views
How to reclassify a float raster?
I have three rasters which represent distance (in metres) from certain things (bus stops, parks, libraries). I would like to reclassify these rasters so that they get integer values based on the ...
1
vote
1answer
120 views
Multiple reclassification using RasterCalc in QGIS [duplicate]
Is there any way to perform multiple reclassification using RasterCalc?
For example reclassifying value 1 to 100 in map Map can be written as:
eq([Map]@1, 1, 100)
But if there are multiple values ...
0
votes
1answer
53 views
Problem Reclassifying Rasters
I need to reclassify some vector data which was made from Euclidian distance from points and lines.
So after getting the Euclidian distances, I tried to run reclassify, but got:
Error 001100 Failed ...
6
votes
2answers
627 views
How to change null values raster values to 0 in QGIS?
I need help... I'm having problems with QGIS. I have some rasters that appear to have null values, even though I reclassified them to obtain a boolean raster :( How can I change the NULL values to 0?
2
votes
1answer
111 views
How to reclassify grey scale tiff in qgis
I downloaded a raster image of the sea floor age. The values in band 1 ranges from -32768 to 32767. I need to reclassify it to no. of million of years to make sense of the data. How can I do so? I try ...
1
vote
1answer
733 views
reclass, raster calculator
I'm trying to apply seperate equations for different land types. I have created a raster containing only the land type I'm interested in. I then reclassed the values to '0'. My plan was to use the ...
2
votes
1answer
286 views
Creating a constant elevation raster with multiple attributes
Is it possible to create a raster with a constant value with multiple attributes? Such as:
rowid value count Name
1 630 36000 Forest
2 630 75000 Anthro
3 630 2600 ...
8
votes
2answers
443 views
How to reclassify a very large land cover dataset?
Consider the NLCD2001 Land Cover dataset for Alaska (download link). I need to reclassify this dataset so that only pixels of value 41, 42, and 43 are preserved; all other pixel values should become ...
8
votes
2answers
3k views
How to perform Raster Reclassification in QGIS?
Is there a way to do reclassify a raster image to Qgis?
In Arcgis you can do that in Spatial analyst Tools-->Reclass-->Reclassify
Any ideas?
3
votes
1answer
67 views
How to get the “absolute value” of a raster cell in QGIS?
I have a raster map (-100 to +100) and I need to get all the minus values as absulute values (-100=100; -99=99...). How can I do this? Is it something like reclassify?
3
votes
1answer
153 views
Issues with arcpy.sa.Reclassify
I have a raster file with classifcation codes, and want to reclassify valid codes to 1, and all others to 'NoData'.
RMAP2 = arcpy.sa.RemapValue([[3.2, 1],
[4.1, 1],
...
1
vote
0answers
122 views
Reclassify ESRI raster using variables from a SQL Server table (connecting with pyodbc)
I am trying to reclass a raster file (representing vegetation and land cover types) using values stored in a SQL Server Express table. I have a set of ~400 species records in the table, with each row ...
0
votes
0answers
110 views
How to Reclassify Raster using ArcGIS Engine?
i'd like to create an application that reclass a raster . user enter his/her range of class in a listbox . the application calculate minimum and maximum of band value . the problem is that i couldn't ...
3
votes
1answer
71 views
What proportion of the 240m area sensed by MODIS must be forest before it is defined as forest?
MOD12 is a MODIS product at 240m resolution. Landsat produces 30m resolution products, which I resampled to 240m resulting in a raster of proportion forest cover in each 240m pixel (based on the mean ...
4
votes
1answer
471 views
How to reclassify in Rastercalc?
I now need to reclassify, I'm using rastercalc... but I can't get the syntax right!!
I need that values >0 become 1
I found this example...
eq( [relief]@1, [mask]@4, 150 )
so I tried:
( [raster A ...
4
votes
1answer
106 views
Reclass all values < 0 to -9999 in PostGIS
I have a tiled raster in a PostGIS table and I would like to change the value of all pixels which have values less than 0 to -9999. How should I do this?
I suspect it involves ST_SetValue and ...
3
votes
2answers
986 views
Reclassify raster values of 9999 to NoData, leaving all other values alone, in ArcGIS
I've got a really stupidly simple question, but I can't seem to work out how to do it.
I have a raster in ArcGIS which has a number of cells with the values 9999, showing that the data could not be ...
3
votes
1answer
759 views
ReClassify Vector Data Between Values
I would like to be able to take all values between 1 and 10 and have a field define them as 1, and all values between 10 and 20 and set them to 2, how do I do that with vector data?
I read how to set ...
5
votes
2answers
466 views
Raster to Vector: Displaying classes in Vector Layer - GRASS GIS
I use Maximum Likelihood classification to classify Landsat image into two landuse classes - one of my interest and rest including all others. Inorder to assess the accuracy I export it in vector ...
