Questions tagged [colormap]
The colormap tag has no usage guidance.
63
questions
2
votes
0answers
18 views
Converting 3-band raster of a topo map into Unique Values with Colormap or by Reclassifying using ArcMap
I'm using a 1998 USGS topo map for a geologic map base in ArcMap 10.5.1. Right now, the topo raster is in 3-bands with an unsigned 8-bit pixel type. Strictly for cartographic reasons, I need to strip ...
0
votes
0answers
54 views
Creating Raster Colorizer with ArcPy for ArcGIS Pro
I'm having trouble trying to write the Colorizer code for an NDVI Raster in ArcGIS Pro.
The raster is single band, and if I set the discrete colorizer through the Symbology window, I then can access ...
0
votes
1answer
18 views
Are raster color band codes standardized in ArcMap/ArcGIS?
I have multiple TIFF files which contain rainfall data. Different colours are associated with different levels of rainfall.
When I add the files to arcgis, a colour/colour code is created.
These two ...
0
votes
0answers
53 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
28 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
273 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
30 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
18 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
71 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
81 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
960 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
16 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
61 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
124 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
68 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
100 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
95 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
993 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
288 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
964 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
75 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
3k 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
2k 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
560 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
41 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
756 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 ...
9
votes
2answers
743 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
296 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
629 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
349 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
509 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
40 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
623 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
813 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
726 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
61 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
104 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
109 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
113 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
1k 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
71 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
536 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
396 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
633 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
115 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
122 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, ...
