Questions tagged [colormap]
The colormap tag has no usage guidance.
61
questions
0
votes
0answers
25 views
Do GeoTIFFs support color tables?
I checked the official GeoTIFF documentations and there is no reference to color maps. Regardless, I see color maps or tables referenced everywhere, including in other questions.
I am aware that a ...
0
votes
0answers
20 views
Record colour values which are assigned by plotting with a colourmap
I have a grid of polygons covering the surface of the Earth, and each polygon has an associated value (population density). When I plot this, a colour is assigned to each polygon based on its value ...
0
votes
0answers
17 views
Gdaldem color-relief gives uniform-colored GeoTIFF
I have generated a GeoTIFF from grib temperature data in greyscale using:
gdal_translate -of GTiff -a_srs EPSG:4326 -b 28 2019-07-21-120000.grib2 output.temperature.tiff
This is a 32bit floating ...
0
votes
1answer
44 views
Custom Colormap (cmap) rasterio, Python
I wish to display custom colours for the pixel values in my raster. How can I create a custom colormap (cmap)?
In the example below, I have specified "magma" as the colour map. However, I ...
0
votes
1answer
25 views
Cannot count the cell amount
How can I count the colorwise cell amount of a layer file? The attribute table is hidden in the menu.
Is there any tool to do that?
0
votes
0answers
14 views
Matlab mapshow raster plot change colormap
I want to change the colormap of a raster plot with mapshow(), however it always plot in grey:
figure('position', [500, 40, 950, 950]);
mapshow('RasterFile.tif', 'DisplayType','image');
colormap jet;
...
1
vote
1answer
16 views
'Add Colormap' tool returns nothing in ArcGIS Pro 2.2
In QGIS 3, I created a text file for my symbology.
Here it is:
symbology.txt
# Fichier d'exportation de palette de couleurs généré par QGIS
INTERPOLATION:INTERPOLATED
0,0,204,170,255,0
8,0,204,170,...
0
votes
2answers
56 views
Randomly coloring provinces in country map? [closed]
I have created a map of a country in QGIS.
How do I color the province individually ?
Is there a quick way to randomly coloring all the province of a country.
I am using the "...
1
vote
1answer
40 views
GDAL Creating color ramp gives “ERROR 1: TIFFSetField:Images/out.tif: Cannot modify tag ”PhotometricInterpretation“ while writing”
I am receiving a weird error when creating my color ramp using GDAL color options. Here is a working version of my code
import numpy as np
import os
from osgeo import osr, gdal
#Load in and format ...
2
votes
1answer
331 views
python-gdal write a GeoTIFF in colour from a data array
I have a 14400 x 7200 (360 x 180 at .025 deg resolution) numpy array containing data which I want to make into a GeoTIFF. I have done the following which creates a GeoTIFF fine:
# Set file vars
...
1
vote
0answers
14 views
Phenology divergence color map per pixel
My aim is to create a map displaying the start of spring for vegetation which is a set average value, I want for each pixel to know on which date it is actually trespassing this value. So lets say ...
1
vote
0answers
46 views
Retrieving individual pixel height data given color table/relief data and color shaded relief map using C# and GDAL?
I am using C# GDAL/OGR/OSR bindings. I have a GeoTIFF file where each pixel is stored as a color in a Red, Green, and Blue raster band. I have a color table/color relief file (.csv) which I am able to ...
2
votes
0answers
66 views
Use color map from .tif.aux.xml from ArcGIS in QGIS
I have a raster file (.tif) of different ecosystem types (from natureserve). Each value corresponds to a different type. I'm trying to get a table of those attributes and colors. The file includes (...
0
votes
1answer
63 views
High resolution and reasonable cost RGB satellite images [closed]
I need to obtain high-resolution RGB satellite images with reasonable cost for Pakistan. The objective is to guide tourist on high-resolution GIS maps. Google Earth does not have very high resolution ...
0
votes
0answers
90 views
Creating color relief from GeoTIFF using gdaldem returns font name
I'm trying to generate a color relief map from a SNODAS greyscale geotiff file scaled from 16-bit to 8-bit. Given the type of data and the scaling, it seems the pixel values are set at 1-5, with 5 ...
0
votes
0answers
85 views
GeoServer: colormap for point data
How could I create a continuous colormap for point data in GeoServer?
I am planning to serve satellite measurements (METOP IASI) as point data in GeoServer 2.15 and want the point colors to represent ...
0
votes
1answer
845 views
Changing color scale in KML files?
I want to work with kml/kmz files in the Google Maps API, but I want to remap the color scales.
Is that possible?
Here are example kml/kmz files where I'd like to change the color representation ...
0
votes
0answers
228 views
How to include colors in 16bits one band raster
I have many 16bits one band rasters (geotiff), who basically are in greyscale.
I had created a style for a color representation with "Singleband pseudocolor" in QGIS and save a qml file.
But for my ...
9
votes
1answer
844 views
Creating Mosaic Dataset in ArcMap with Colormap as renderer or adding Colormap after creation?
I have several rasters in tiff format that have a colormap assigned to them:
I then create a Mosaic Dataset with specs matching the imagery and add all of my tiffs to it (you can ignore the warnings ...
1
vote
0answers
74 views
Set colors in colormap to specific index values
I have multiple pictures with 8 bit indexed colors (0-255). In the end I want some of the colors at specific index values. Black has to be value 0 and white 255. Is there a possibility in ArcGIS to ...
5
votes
2answers
2k views
How to let rasterio use a colormap file when showing a TIFF
I'm new to rasterio. I have tried this example. My raster file is a GeoTIFF file and I have a colormap file available in ESRI *.clr format, with 58 lines. The values in the GeoTIFF file range from ...
7
votes
2answers
1k views
Converting ArcGIS raster colormap file (*.clr) to QGIS style file (*.qml)
I have an ArcGIS colormap (*.clr) and I want to open it in QGIS to apply a predefined style.
The *.clr file is really simple, only has four columns representing [value] [red] [green] [blue], as this ...
0
votes
0answers
521 views
Correctly display the colors in MATLAB colormap and colorbar?
I am plotting spatial maps with fill values ranging from 0.05 to -0.05
Below is the part of code for plotting colormap and colorbar
colormap(brewermap([10],'RdYlBu'));
caxis([-0.05 0....
1
vote
0answers
40 views
Rasters after mosaicing don't have the same colourmap
I have topographic maps in form of image files. In order to make a DEM, I need to make a mosaic of them but there is a problem. I tried to make mosaic with Mosaic colormap Mode - FIRST, but still ...
1
vote
1answer
630 views
Extracting RGB values from symbology of .lyr or polygon file using ArcGIS Desktop?
I have a polygon shapefile of geological units. Someone has already created a symbology and assigned standard colours to the units, available as a .lyr file.
What I need to do is create a list of the ...
7
votes
1answer
560 views
Circular color map in QGIS
In order to plot azimuth values for example, does anyone know any good circular color map?
By good I mean, visually suited for human color perception.
I didn't find any suited color ramp preset in ...
1
vote
0answers
280 views
ArcGIS colormap is not active?
i have a problem in ArcGIS with colormap. It is not active. I follow the steps written here http://desktop.arcgis.com/en/arcmap/10.3/manage-data/raster-and-images/creating-a-color-map-clr-file.htm, ...
1
vote
1answer
601 views
Custom matplotlib discrete colormap with fixed values on raster
I've been using a color ramp with fixed values (0-255) corresponding to specific rgb color (discrete interpolation) for 8bit tifs in QGIS. I've used matplotlib to apply built in colormaps, but I'm ...
3
votes
2answers
339 views
Colour gradation in ArcMap - shades of blue
I have created a map of the United States with concentric circles around a geographic point, namely Detroit. I was able to give the different circles around the city colours of different grey shading. ...
2
votes
1answer
491 views
QGIS 2.x - 4 colors theorem - TopoColour and Map Coloring plugins [duplicate]
I try to use TopoColour or Map Coloring plugins to color my polygon layer:
Both of them doesn't work or I do something wrong. Maybe somebody knows any other plugins which color shapes according to 4 ...
1
vote
1answer
39 views
Choosing color classes for comparing differently distributed spatial data
For comparison, I want to draw two maps alongside each other. Both maps should use the same color classes/scale. The problem is that the data for the maps is very different: The data for the first map ...
3
votes
1answer
589 views
Specifying values in stretched raster histograms of ArcMap?
I am trying to use the stretched color option with a topography raster. I have a color bar that I painstakingly make in arc and I am basically trying to set values of the topography equal to certain ...
2
votes
1answer
577 views
Style points using color gradients with QGIS
I need to style a shapefile with a specific color gradient, but considering absolute values.
It's point shapefile with values between 0.19 and 0.70 (considering they're in an absolute scale between -1 ...
2
votes
1answer
658 views
Why does my raster layer disappear when changing colors?
When I change the colors of a raster layer (EVI), the layer disappears. Here are my color settings:
2
votes
0answers
53 views
ArcPy - Force layers to inherit their ColorMap when visualized
I have a large set of GeoTiff's which after manipulating I apply a colormap to the ones I want to visualize with:
arcpy.AddColormap_management(raster, "", color_map)
I then add them to my ...
6
votes
1answer
2k views
logarithmic color scale
I am using QGIS Essen on Windows 10. I have a data set (.txt file) that contains latitude, longitude, and black carbon (BC) values. I can style the layer using the values of BC - graduated style, ...
0
votes
1answer
2k views
color point shapefile based on cell values
I am using QGIS.
After exporting a point shapefile from a raster file, I like to know how can I color the point shapefile with a cell values.
1
vote
0answers
96 views
Color .xyz files with QGIS
I like to know how can I color a xyz file based on the Z values(elevation) with QGIS, by python or graphicly
0
votes
1answer
100 views
Why do Landsat 8 grayscales have a range of (0, 2^16-1) while the screen colors are (0, 2^8-1)?
The grayscale levels in Landsat(0-65535) are more than that can be displayed on a standard display screen(0-255). The use of Landsat reflectance values must be more than just display purposes, which ...
4
votes
2answers
4k views
Python: color Canadian provinces in a shapefile based on given values
The goal here is to create a choropleth map of Canada in Python. Suppose I have a dictionary with values referring to each Canadian province/territory:
values={'Alberta': 1.0,
'British Columbia': 2....
3
votes
0answers
109 views
gdaldem exact color matching fails
I'm using gdaldem color-relief to read a Uint32 raster and write an RGB tif. The input color_text_file has one line:
102216130 23:105:102
My input file is a single (large) pixel of value ...
0
votes
1answer
988 views
Converting PNG map to polygons with colors and value using ArcGIS for Desktop?
I need to use this map (PNG file) in which each color is a population density:
I've already located it using Georeferencing. Now I need to convert it to shapefile with polygons, and narrow down its ...
2
votes
0answers
69 views
ST_ColorMap wrongly loses 0.0 value when INTERPOLATE
I want apply a colormap to a monoband grey scale tiff from postgis calling ST_ColorMap.
My query is something like
"SELECT oid, lowrite(lo_open(oid, 131072), tiff) As num_bytes " +
"FROM ( ...
2
votes
1answer
509 views
Geoserver Dynamic Colormap using CQL won't validate
I'm trying to create a dynamic heatmap using GeoServer 2.8.3, but when it comes to validating the colormap-part of my SLD i keep getting the same error:
line 66: cvc-datatype-valid.1.2.1: '${env('...
2
votes
1answer
340 views
QGIS raster no data value changed to -inf when viewing at smaller scale
I have a raster with some no-data cells.
I want to visualise raster values using a colour map and set the no data values to transparent. I am attempting to do this using the transparency tab in the ...
1
vote
1answer
581 views
How does GeoServer/RasterSymbolizer ramp interpolate?
I want to encode data using a colormap using GeoServer/RasterSymbolizer, by mapping data using the full 24 bits in RGB. I am thinking of the following scheme:
<ColorMap type="ramp">
<...
-1
votes
1answer
114 views
Raster colormap setting in ArcMap not honored in GP tool
I am working with digital versions of paper maps. Here is what I am attempting to do:
In ArcMap determine the value in a raster's colormap that is the
undesired black mask / "no data" section.
Set ...
2
votes
0answers
121 views
More control on raster colour maps? [closed]
I'm playing with various raster layers (DEM, geophysical data such as gravity or gamma-ray, etc). QGIS does a fine job at reading and displaying them, but I'm looking for more control on symbology, ...
1
vote
1answer
115 views
What is the “clip” feature for color ramps?
In the singleband pseudocolor band rendering, there is a Boolean checkbox "clip". What does this do? I don't notice a difference in my maps and haven't found documentation for it.
2
votes
1answer
1k views
How to label feature of shapefile on the color map in matlab
I am trying to make color map from text file data. I am using geoshow to call shapefile of the region and to set it as back ground of the color map. My shapefile is of the country. I have digitized ...
