Questions tagged [color-ramp]
A range of colors used to show ranking or order among classes on a map.
154
questions
0
votes
0answers
23 views
Applying same color ramp to multiple layers in ArcMap (in one step)?
I attached the image where you can see the layers in my tabnle of contents. The first one has the wanted color ramp, which I want to apply to the rest down there. There must be a way to avoid doing it ...
1
vote
1answer
42 views
Assigning QgsCategorizedSymbolRenderer Spectral Ramp to MultiPolygon
I currently have a Python script that adds a MultiPolygon shapefile to my map within QGIS. Within QGIS, I can apply a categorized symbology render, with the color ramp 'Spectral' going from blue to ...
0
votes
1answer
63 views
Specify start/stop within color ramp in QGIS
I'm trying to color values along buffered two-point lines with a color ramp in QGIS. The color ramp should represent the height of the lines, that varies linearly from start to end point. Now I cannot ...
1
vote
0answers
32 views
Specify absolute center for bi-directional color ramp in QGIS?
How do I center the color ramp on '0' for a series of raster with positive and negative values?
The values are non-normally distributed.
There doesn't seem to be a an 'absolute' option, only relative (...
4
votes
1answer
105 views
Colours for positive and negative values in a raster layer in QGIS
I've got a raster layer in QGIS 3.10. It's statistics are the following (hopefully understandable although in Spanish):
Valor mínimo: -0.36928805708885193
Valor máximo: 0.6040433645248413
Intervalo: 0....
1
vote
2answers
59 views
Symbolizing raster layer with Python QGIS
I have a simple Python code that makes some calculations on rasters and give me some output rasters; I have also a style saved to color rasters based on pixel values.
Is there an option to load the ...
5
votes
3answers
145 views
Importing color ramp into QGIS 3.10
I would like to use a set of color ramps that are available at CPT-CITY but cannot find any way to import the downloaded files.
Note that I have found the Catalog: cpt-city option under the Create New ...
3
votes
0answers
23 views
QGIS Singleband pseudocolor Continuous symbology
If you want to configure the symbology of a raster in QGIS using render type 'Singleband pseudocolor', you can choose out of 3 modes to generate values in the table (continuous, equal interval and ...
2
votes
3answers
59 views
Filling polygon with 2 different colours representing 2 different sets of data using QGIS
I have a map of England where counties are polygons. I would like to fill them with 2 colours; each half corresponding to a specific set of data. Is there a way to do that?
I have included an example ...
2
votes
0answers
36 views
How to deal with extreme values messing up Graduated colours? (ArcMap)
Is there an easy way to deal with extreme values messing up the Graduated colours of a map and skew the intervals in such a way that the colour ramp still makes visible sense?
I have a map displaying ...
1
vote
0answers
22 views
Generate color ramp scale for imported base map in QGIS
I have imported a bathymetric layer, showing depth variation around an archipelago, which I'm using as a basemap. I would like to create a scale bar for it, showing max and min recorded depths.
Is it ...
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0answers
38 views
Convert MATLAB colormap to QGIS
I want to to use a very good looking colormap/color ramp from a MATLAB program LINK in QGIS 3.x.
I already tried to save a colorramp from QGIS and insert the values from the MATLAB colormap after ...
3
votes
2answers
199 views
Color map or SLD for Global Wind Atlas?
I am trying to use the Global Wind Atlas for a map about alternative energy:
https://globalwindatlas.info
I have downloaded the 14.5GB geotiff of global wind power density. QGIS reads it perfectly and ...
2
votes
1answer
112 views
PyQGIS: How to apply a color ramp on the symbol's outline when using QgsCategorizedSymbolRenderer?
I have polygon layer containing overlapping features (service areas for several years) and I want their symbology to
use a color ramp in QgsCategorizedSymbolRenderer applied for each year
use a ...
1
vote
1answer
319 views
Adding continuous color ramp as legend using ArcMap [duplicate]
I am interested in adding a continuous color ramp legend with numerical labels like the following example to place on the layout view of arcmap:
I am quite new to arcMap so I'm not sure how I can do ...
1
vote
1answer
37 views
How to create a color ramp based on a quantitative range?
I have a set of polygons with correlation values. I would like to color each polygon based how strong their correlation value is where 0=lightest and 1=darkest. This means if I have a set of 3 ...
1
vote
1answer
75 views
How to combine color ramps for two different layers?
I have two layers that contains 5 polygons each with their own values. I would like to make a global color ramp that encompasses both layers. But I am not sure how I can do this. I have tried setting ...
0
votes
0answers
25 views
R nightlights color palette blue to yellow
I would like to plot nighttime light images in R using traditional NASA used color palette from blue to yellow. Does this color palette exists in any package?
0
votes
1answer
35 views
Convert SHD files to CLR or more modern color ramp format
I have a legacy SHD file (from Arc/Info) that contain color ramp information that I would like to use to symbolize a raster layer in ArcGIS Pro. I have access to an Arc/Info installation and am able ...
3
votes
0answers
122 views
GDAL ColorRamp for Float Based Values
I have a performed band calculation to calculate the NDVI grayscale. It has float based values on a single band, between 0.0 and 1.0 respectively. I am attempting to colorize the single band via ...
0
votes
1answer
123 views
ArcGIS Javascript 4 API - Class breaks visualization in GeoJSONLayer
I'm trying to create a data-driven visualization using a GeoJSONLayer with ArcGIS Javascript 4.14 using "esri/renderers/smartMapping/creators/color" on a field named "Number" (specifically a Class ...
1
vote
1answer
174 views
How can I make a heatmap of polygons using a graduated color scheme in QGIS?
I want to make a heat map of species biodiversity like the people did in the picture below. I can sort of get it to work by setting my layer with multiple polygon subclasses in the Layer styling panel ...
3
votes
0answers
121 views
What is tilde (~) for in R? [closed]
I know this is an almost too simple question. But maybe there is a fast answer. Looking through some code to build a leaflet map in R I found that part of code:
mypal = colorNumeric(
palette = "...
7
votes
5answers
1k views
Apply a color ramp to vector layer using PyQGIS3
I'm trying to apply a color ramp to a QgsGraduatedSymbolRenderer in PyQGIS 3 (QGIS 3.8) using the following code:
Getting the QgsGradientColorRamp:
myStyle = QgsStyle().defaultStyle()
...
0
votes
2answers
127 views
Apply external choropleths in QGIS 3
I have a large number of cloropeths stored in SLD and QML formats. QGis is unable to apply any of those, there is no option in the GUI for SLD, whereas it fails to apply QML files correctly.
Is there ...
3
votes
2answers
404 views
QGIS Time manager Changing Color Polygon
I'm using QGIS 3.6.3. Noosa.
I have 10 polygons, each has a starting time and an end time. Getting Time Manager to run was no problem at all. However, there are two things I would like to add in my ...
2
votes
0answers
172 views
Discrete color ramp in QGIS
This seems basic but I am new to QGIS and I can't find how to do it. I have three shape files each with the same attribute. Each shape file is imported into its own layer. Each shape file has ...
1
vote
1answer
68 views
Proper way to share raster layer
In ArcGIS I have used to share a shapefile (for example beach areas) by sending a package that contains different files (.shp, .shx, .prj, .cpg, .dbf, .sbn, .xml) which contains all necessary ...
3
votes
6answers
986 views
Rule based coloured background for labeling in QGIS
I am a newbie working on QGIS 3.6 / Windows 10. I need to label a polygon layer which is categorised by colour.
(pls refer to attached pic as a graphical reference)
The labels need to have a ...
2
votes
1answer
572 views
Making colored hillshade in QGIS?
Today I found that ArcGis can make colored hillshade like on piture below.
Here is link to their blog. I want to do that in QGIS. I know about layer coloring feature, and it's close for perfect, but ...
1
vote
0answers
60 views
Setting color assignment order with ArcPy?
I have a shapefile feature class with the following attribute table:
I set the shapefile symbology using these lines:
lyr.symbology.valueField = "GRIDCODE"
lyr.symbology.addAllValues()
What i get ...
1
vote
1answer
240 views
Apply color ramp to (QgsSingleSymbolRenderer) Simple marker
I'm using a QgsSingleSymbolRenderer to display various points and lines etc for a Line geometry.
I have a Single symbol symbology to display the last vertex as a: Line > Marker line > Marker &...
1
vote
1answer
171 views
Making color text file using GDAL?
I have an 8-bit greyscale image that I want to convert to a "heat map" based on data values (0-255), using a color ramp. I'm aware that gdaldem works with color-relief, so I used the following steps ...
0
votes
0answers
97 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 ...
6
votes
2answers
279 views
Forcing color ramps to center around zero in QGIS
I have several columns of data that have percentage values. Some are positive and some are negative. In one particular column, the values range from -0.70 to +0.20. The mean value of the column is ...
3
votes
2answers
386 views
Adjacent DEM color matching in QGIS?
I have four 15 arc second resolutions DEM files (15-C.tif, 15-D.tif, 15-I.tif, 15-J.tif) downloaded from viewfinderpanoramas.org. When I input them in QGIS I noticed that the 15-J.tif layer differs a ...
0
votes
1answer
411 views
User-Scaled Color Relief Map to Google Earth from DTM
I have a DTM file, and my goal is to load it up onto Google Earth as a color relief map, with the colors gradient at levels I chose. I have successfully done this with RAS MAP using HEC RAS software, ...
10
votes
1answer
765 views
Apply a different color ramp to subset of categorized symbols in QGIS?
The goal is applying a color gradient to a subset of symbols, instead of applying it to all the existing symbols. I used to do this in ArcMap. In QGIS I have to do it manually, and it's very time ...
0
votes
2answers
122 views
Displaying rainbow colors for multiple polygon layers in ArcMap?
I am working with ArcMap and I have a series (20) layers - polygon lines in a group. I would like to ask you a way to color (not manually) all the lines with a rainbow color palette. The lines are map ...
1
vote
2answers
478 views
Calculate 16-bit elevation values from a 32-bit RGBA image?
Say a single-band 16-bit (UInt) raster with values representing elevation (meters) must be converted to a 32-bit RGBA PNG image (8-bits/band) for use in a web application. The image dimensions must be ...
2
votes
1answer
316 views
How to delete custom color ramp in QGIS?
I have customized a new color ramp in qgis. Now I want to delete that. I could not find any way to delete this.
3
votes
1answer
426 views
Force a minimum value in a color ramp classes in QGIS 3.4.1
I am trying to apply a color ramp to a shape using percentage values where red would be low and green would be high. The data ranges from 74% to 100%, but I need the minimum value to be 0%, so that ...
1
vote
0answers
134 views
Transfering color style from one raster to other rasters using QGIS?
I have a raster set and I need to classify them using the "pseudo color singleband" with "RdYlGn". What I'm trying to do is classify a raster and copy the style to the others, but it does not work ...
1
vote
1answer
453 views
QGIS: where are custom color ramps stored?
Using QGIS 3.4.0, I have created a new custom color ramp, using:
Settings > Style Manager > Color ramp > green plus sign
I saved the new color ramp as follows:
The color ramp works just fine.
Out ...
2
votes
2answers
294 views
Heatmap-no data vs Zero
I am new to QGIS. I am working on creating heat map of bird diversity(data downloaded from ebird.org). The issue I face is that how to differentiate between:
There areas where data is not available (...
0
votes
1answer
1k 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
38 views
v.surf.idw raster file conversion into a vector with same colours style
Is it possible to convert from raster to vector the raster file resulting from grass interpolation algorithm "v.surf.idw" coloured with the quantile method and maintain such colours in the vector file ...
0
votes
2answers
79 views
Making colours proportional to value field, continuously and not discretely as with graduated colours classification in ArcGIS Desktop?
Under symbology in ArcGIS, there's the option to graduate colours given a value field, a colour ramp, and some classification.
How do you make the colour graduation continuous (rather than discrete ...
7
votes
2answers
1k views
Creating new QGIS color ramp from r,g,b text file?
I am using QGIS 2.18.22
I would like to create the Cividis color ramp in QGIS. Here's a (non-cartographic) display example of Cividis:
Source
Cividis' creators have made public a 256-line r,g,b ...
5
votes
2answers
405 views
Creating graduated point circles in ArcGIS Desktop?
I have not been giving any data, but I have been told that I could be expected to recreate maps In ArcGIS 10. Below is an sample portion of what I may have to recreate. I have no idea how to get ...
