Questions tagged [mapping]
The act or process of making a map.
529
questions
2
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1
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31
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Some labels are not shown in a rotated atlas object (QGIS 3.28.8)
I have a problem that some labels from polygons are not shown in my atlas when the map is rotated. If I switch the map rotation off all labels are placed just fine. I created the atlas objects with ...
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1
vote
1
answer
63
views
Making world map with terrain colours in QGIS
In QGIS I would like to create a world map that has terrain colours (e.g., deserts or vegetation), as in the attached map (Gehring et al. 2022), particularly for the African continent.
How should I ...
0
votes
0
answers
19
views
QGIS Export Map to Image not to scale
When I do a Export Map to Image using QGIS then insert into C3D using Mapiinsert it does not come in to scale. I have successfully done this in the past so I'm not sure what is going on. Any ideas?
...
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1
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0
answers
30
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How to automate the design and production of 5 thematic maps in a single layout in QGIS
I am currently working on a project to map cleanliness incidents in all 19 boroughs of the City of Montreal. I must represent 5 variables out of 7 of the top 5 cleanliness incidents reported by ...
- 141
2
votes
1
answer
52
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Making gridded map where each grid cell shows the share of points of certain category in QGIS
So, I have a dataset of many points across Europe. For illustration purposes see this image below:
Each of these points has one of four categories attached to it, so the dataset I am working with has ...
- 161
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votes
0
answers
63
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Adapt this code to highlight all returned matches from search field in an OpenLayers map
I have an OpenLayers map documenting nut trees on my farm. I have a search field to search the type of trees. When a single tree is selected in the search dropdown a tree is highlighted. I would like ...
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2
votes
1
answer
34
views
How to hide layers on the "minimap" in the print layout [duplicate]
I am new to QGIS and I am running into a small problem. How do I hide the layers (shapes) showing on the minimap in the print layout? I want them to show on the big map but not on the small one ...
- 23
0
votes
1
answer
20
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Compute mean value of a band on each image in an Array
I try to compute the mean value of a band on each image of an imageCollection and store all the values in a Array to compute the RMSE with another dataset that I will also store in an Array (not sure ...
3
votes
2
answers
140
views
Snapping options in QGIS 3.28.11 Firenze
I work with 60 layers in QGIS, I have to set the snapping for each layer to vertex & segment. Is there any way to set this snapping options for all layers in one time instead of doing this for the ...
- 31
0
votes
0
answers
31
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Issues with QGIS map projection and symbolizing point data
First off, I am using version 3.28 QGIS-LR on a Macbook 2015. I am currently taking an introduction course to GIS. One of the assignments was learning to project maps and visualize point data using ...
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answers
49
views
QGIS, Exporting .svg from a map, I can not produce it with as much resolution as in the main window
I am doing a PhD in wildfire modelling so that I need to deal with GIS data, mostly for visualizing purposes and data preprocessing.
I am connecting to a XYZ tiles to produce a satellite map. In ...
0
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0
answers
51
views
Export layers in QGIS back to OSM format
I downloaded a Delaware OSM file from the Geofabrik website. I want to simplify and reduce the size of the graph to speed up queries (eventually I'll run it on whole US). I'm only concerned about the ...
- 31
0
votes
1
answer
42
views
Colouring wrld_simpl countries with a variable
This seemed at first rather easy but turned out to be impossible to solve.
I want to plot the wrld_simpl map but coloring the countries with a color gradient that depends on a variable. The countries ...
- 119
1
vote
2
answers
107
views
Creating map of visited airports in QGIS
I looked at the information given regarding airports and have downloaded that data into a CSV file for import.
I have created a shapefile for my base map using OSM.
How do I import the airport data (a ...
- 13
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votes
0
answers
13
views
Inconsistent polygon transparency with terra::polys
Using terra 1.7-23, when adding polygons to an existing map with the polys function, the alpha argument works as expected when plotting more than one polygon together, but when polygons are plotted ...
0
votes
1
answer
84
views
Why are the coordinates at the grid not correct in QGIS print layout
UPDATE: The answer with the Decimal values for the grid, that has already helped.
But It still seems to be incorrect. Y=0 Is not aligned to Greenwich.
See Image 3 at the bottom of the page....
I ...
- 151
2
votes
1
answer
221
views
Blurry resolution when uploading DEM 5ft data onto QGIS
I am creating a map for the nature preserve I work at. I have been downloading Kentucky elevation data from THIS website. You can see that there is a really high resolution, and I am able to see the ...
- 29
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0
answers
34
views
QGIS Least Cost Path Analysis taking forever
I have been trying to calculate the Least Cost Path (LCP) between two points on my map. These points are approximately 100km apart. I have created a slope from my DEM raster, created proper vector ...
- 1
0
votes
0
answers
25
views
Blank output on 3D Map view on height data with projected CRS - QGIS 3.30.3
I have some CSV height data which has been imported as Lat,Lon,Height with a CRS of EPSG 4326.I want to produce a 3D view which shows each height element as a column and ideally join the points with ...
- 19
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votes
0
answers
50
views
How to create multiple maps that once printed can be sticthed together in QGIS
I have a map of a parish which I can print as A1 at say 1:25000 scale.
However, if I want to close in on the same area at say 1:5000 scale, then how can I then create different maps in that parish ...
- 21
0
votes
0
answers
270
views
Canadian Postal Code Boundaries from Google Maps
I am working with the R and Python languages.
Suppose I search for the following Canadian Postal Code (M5V 3L9) on Google Maps:
https://www.google.com/maps/place/Toronto,+ON+M5V+3L9/@43.642566,-79....
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4
votes
1
answer
104
views
How to use XYZ tiles from zoom 11 to a higher zoom
I have generated my own map tiles for zoom 11 (only). I display these tiles in QGIS via XYZ tiles (as a new connection - file:///D:/tiles/11/{x}/{y}.png). They show up fine for the zoom 11.
However, I ...
- 43
1
vote
0
answers
37
views
QGIS: print composer legend layer order management trouble
In the print composer I cannot change the order of items displayed in the legend: the buttons "Bring up/down items" seems not working: after doing their task for few times, suddenly instead ...
- 121
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votes
1
answer
27
views
Reclassified image not showing in Google earth engine
What I am trying to do is simply reclassify the spectral indices generated in the google earth engine based on some threshold values. The thresholds are generated in the earth engine platform only. I ...
- 11
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vote
0
answers
87
views
Identify EPSG code from image
We made a project where we asked students to draw things on a map. Now I would like to import the results into QGIS, but I am unable to find it. I used a picture but cannot find the name of the ...
- 21
0
votes
1
answer
42
views
How to export raster with vector in QGIS?
I have a question.
I have a raster and vector.
And I want to export '.jpg' file as raster with vector.
Is there any way?
raster is map
vector is road of map
- 41
0
votes
1
answer
48
views
Biking layer in Google Earth Engine
I would like to add a biking layer like the one available in Google Maps (under Map details, see example below) but couldn't find any guide or information about its availability in Google Earth Engine....
- 1
0
votes
0
answers
29
views
How to map a stream that flows through a paddy field without a proper channel
I'm mapping a stream in Kerala (India) and found out that a stream flows onto a paddy field and flows through it. At the end of the field it again becomes a proper stream. How can I map it in the ...
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5
votes
2
answers
254
views
Thousand separator in QGIS for numbers with 5+ digits
How can I use commas to separate thousands for numbers with five or more digits (not four digits) in the map in QGIS, e.g., “10000” should be “10,000” in the annotation.
To clarify, the region in ...
1
vote
1
answer
81
views
Display the difference between two map layers in Google Earth Engine
I am a week 1 beginner at Google Earth Engine. I assumed that the subtract method would display the difference (the increased area) between my two layers: afterMap and beforeMap, but it does not.
var ...
0
votes
0
answers
209
views
Create country boundary mask on SpatRaster file using terra and ggplot in R
I'd like to create a map of sea surface temperature displaying my countries of interest as a mask, using terra and ggplot.
I've got a SpatRaster of sea surface temperature and a shapefile object that ...
- 3
0
votes
1
answer
291
views
Plotting map points in different colours in R
I am trying to use mapview() to plot some geographical data, but somehow I can't find a way to plot two different data sets in different colours.
In my case, I want to plot occurrences in summer and ...
- 101
0
votes
1
answer
96
views
Adding polygon geometry to numpy array to plot it with background
I'm trying to plot image I treated in dataframes.
I need to add geometry to it in order to plot it with a background.
I should have used GeoPandas and geodataframes in the first place.
I have arrays ...
- 33
0
votes
1
answer
50
views
How to keep the X and Y bounds fixed when I plot geographical coordinates using mapview?
I am trying to plot occurrences in different months using the mapview () function
x=data.frame(read.csv(file.choose())) ## choose the original CSV file downloaded from ebird
jan=x[which(x$Month == &...
- 101
4
votes
2
answers
178
views
How to get coordinates of specific measurement in line layer in QGIS
Let's say I draw a line through a map in QGIS and I know the coordinates of the Start-point and endpoint, but I need to know how could I get the coordinates of a specific distance (inside) line... ...
- 43
0
votes
1
answer
96
views
Advice on mapping tool (world map, Robinson projection, visualise wine production)
I’m looking for some advice on finding the right mapmaking tool. I think what I want is rather simple but I’ve gotten stuck every turn I took.
Requirements:
I’d like a map of the world in Robinson ...
2
votes
1
answer
445
views
Upload shp, dbf, prj and shx [duplicate]
I have four files from a download of a bathymetry map and sea depth lines. I want to upload the four files to QGIS because I understand that each file has different information, but I can only load ...
- 21
0
votes
0
answers
26
views
Does PDAL operate on pgPointcloud PcPatch objects? (Trying to figure out how/if PDAL, PCL, Entwine, PostgreSQL fit together.)
I'm starting from nothing; I have large amounts of lidar scan points and image data that I need to process and store and create deliverables from.
I've never used PDAL, PCL, GDAL, PostgreSQL or ...
- 1
2
votes
1
answer
98
views
Continental divide between rivers Danube and Rhine in Germany (watershed vector data) in Google Earth
Is there a line available for Google Earth that is showing the continental divide between the Rhine river and the Danube river? For me, it would be crucial to see where the rainwater is going to go.
- 21
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votes
0
answers
22
views
Problem with showing data (Batch GPS Importer)
I'm trying to show all my tracks from the last years in one map. Works excellent, except one year. After using Batch GPS Importer for this particular year 2021, I can only see a small part of a lot of ...
- 1
1
vote
1
answer
396
views
Use data from JSON file with Leaflet GeoJSON marker
I have a JSON file that I am fetching from and I would like to use the 'LAT' and 'LON' attribute to place markers. The problem is I am unable to see any markers appear. I think it's because the file ...
- 65
-2
votes
1
answer
135
views
Make very detailed SVG map of world country borders and administrative objects
I need very detailed map for my project, in Mercator projection.
I tried to find downloadable resources, even not free, but all that I have found is in very bad resolution.
I need as much detailed ...
- 1
1
vote
1
answer
194
views
Exporting file with layers from Google Earth Engine [closed]
I am brand new to using Google Earth Engine or coding in general. I have created a map in Google Earth Engine using Hansen Global Forest Change (tree cover and forest loss layers), Global Multi-...
1
vote
1
answer
94
views
Making points appear on top of lines in QGIS
Lines are showing on top of points when I want them to show behind. Please see picture for reference.
- 11
2
votes
0
answers
39
views
Auto update legend without specific layer informations that still have to be displayed in the map
I am creating a map and want to export it via the atlas feature.
In this map, I want to display certain symbols that I don't want to be displayed in the legend item. At the same time, I want to check ...
0
votes
0
answers
229
views
deck.gl: regenerating all layers every time
There are MVTLayer and GeoJsonLayer on the map.
The first one is background.
The second one should request features for current map extent only (i.e. bounding box strategy).
Code:
const map = new Deck(...
1
vote
1
answer
79
views
Defining national borders in TIF file and cutting away excess map in QGIS
In QGIS I am trying to create a shaded relief map of Denmark.
I have managed to fetch the data from https://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/elevation/copernicus-dem/elevation, ...
- 11
0
votes
0
answers
23
views
What is LIS 0.25 degree grid used by GLAM project
I am interested in finding the grid system called LIS 0.25 degree used by GLAM project at https://glam1.gsfc.nasa.gov/. LIS seems to be the Land Information System https://lis.gsfc.nasa.gov/ however ...
- 265
2
votes
1
answer
71
views
Sharing changes to all layouts on QGIS
Currently, I'm working on a project that has multiple print layouts, each displaying specific information and layers of the project, but with the same map elements such as the title, legend, and grids,...
- 177
0
votes
0
answers
47
views
Calculate distance matrix in km units not degrees
I need to calculate the distance of England crimes to the Uk coast. I have a shapefile of the outline of the coast and extracted the vertices. So then I can input the crimes to the coast in distance ...
