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Questions tagged [mapping]

The act or process of making a map.

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How to make a heatmap to show the distribution of attribute values more accurately?

I want to be able to create a heatmap that shows the distribution of the attributed "carbon" value within a merged layer. I have a merged vector point layer that represents the combination ...
Greeny's user avatar
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Georeferencing HiRISE images (Martian North) in QGIS 3.36 for geometric calculations

I want to run various geometric measurements on Martian structures in QGIS. Therefore I downloaded a JP2 Black and white map-projected HiRISE image (https://www.uahirise.org/PSP_007372_2475). As I am ...
marla's user avatar
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Making population density map in QGIS

I have a CSV file of Red Squirrel trail cam sightings. The file has multiple sightings for each trail cam location and includes date, time and location. Using the Heatmap symbology gives me a good ...
Vic's user avatar
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How to generate values and create a heatmap from 3 different point vector layers in QGIS

I am new to QGIS and would like to turn what I have into a heatmap. I have 3 different sets of points that go across the map of a UK (see the image attached) that represent coastal marine habitats. ...
Greeny's user avatar
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Bad map display in QGIS

I created a custom projection in QGIS, but there is a problem with its display, especially at the poles of the planet (photos in the link), from what I noticed it is only a visual problem (video in ...
Hermer's user avatar
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2 votes
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193 views

Can I set QGIS to summarize icons above a certain scale and display only the number of icons in an area?

I would like to know if it is possible to set up a function in QGIS to automatically summarize icons on the map above a certain scale so that only one icon is displayed, representing the number of ...
MmVi's user avatar
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-2 votes
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API for determining distance to closest sea/ocean for a given (lat, long)

Essentially I want know for a given (lat, long), what is the distance to the closest sea / ocean. Is there any open / paid API for that? Bonus if there is an API / library in python. I've heard that ...
user3677274's user avatar
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26 views

Using GeoJSON timestamped Folium plugin for data in milliseconds

I have data from different points that a car pass by, and a need to put them in a map, but one by one using their UTC time. The data goes from one millisecond to another, and I need to reflect that. ...
natalia's user avatar
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Error when using tmap: Error in if (hover != "" && !hover %in% smeta$vars) rlang::arg_match0(hover, : missing value where TRUE/FALSE needed

I am trying to make a map using the tmap package in R, because I have a continous raster for which I think using Jenks Nature Breaks would be usful for visualisation. Thus far this is what I have: ...
Birdman's user avatar
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Coloring a QGIS Map with an RGB Column, and Creating a Legend that follows the same color

I'm working on a project in QGIS where I need to color a map using RGB values from a specific column in my dataset (RGB). However, I also need to create a legend that shows the units with their actual ...
Cicada73's user avatar
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How to merge OSM and Microsoft/Google building footprint data

How can I successfully combine Open Street Map vector data with the latest building footprint data from Google/Microsoft or Overture Maps, and convert the result to a PMTiles file successfully? The ...
Sidders's user avatar
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2 votes
2 answers
67 views

Obtaining list of all EPSG code for a single location on map

There are APIs like https://epsg.org/info-api.html, maptiler which takes text input like "San francisco" and returns EPSG codes, but the problem, is I am not able to find a library or a tool ...
uk2797's user avatar
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83 views

How to stitch screenshots of maps together to make one big map

I want to have an interactive city map, where I can scroll around, can make notes on and can zoom in such that I can see individual houses (think of a Thomas Guide). What I've tried My idea was to ...
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Symbology style from SIGEOM database to QGIS with correct legend

I am having an issue with having the correct colors for my map and these colors being in accordance with my legend. I imported a shp from SIGEOM database in QGIS. When I click on categorized in the ...
PlanetaryGeo's user avatar
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Matching satellite, DEM and OSM images

I have a set of satellite GeoTIFF images (from https://xview2.org/) that I want to pair with DEM images from OpenTopography (https://portal.opentopography.org/raster?opentopoID=OTNED.012021.4269.3) ...
Kalia's user avatar
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1 answer
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Create geospatial PDF in Python

I created a figure in Python with raster and vector data. I can save it to a PDF but I need to save it as a geospatial PDF with metadata like transform and PROJCS to open in apps like Avenza Maps. How ...
Mónica Álvarez's user avatar
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Folium map not displayed in Safari

I have created a map with Folium in Python. It is displayed in Chrome. But Safari just shows the page in blank and the map is not displayed. The problem persists after removing markers and other ...
user241935's user avatar
-1 votes
1 answer
103 views

Link drive folder to gee: Display tiff images from drive to gee

I have classified images using many different programs on gee and exported a series of classified images to a folder on my drive. I don't know how I can link that folder to gee so I can display the ...
MNgoc's user avatar
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25 views

Mapping hourly image collection over feature collection with daily aggregation of image stats

I have a feature collection ~ 1600 polygons across the U.S. I have an image collection (NLDAS) where each image is hourly data for the summertime (92 days) across 3 decades ~ 24 hours x 92 days x 30 ...
Ufuoma Ovienmhada's user avatar
1 vote
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30 views

Fix view in QGIS

I have to generate multiple maps for weeks out of QGIS. The view section has to be always the same and I will have to switch off my computer for time to time. Is there a way to fix to a certain map ...
BAE_23's user avatar
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1 vote
1 answer
46 views

Is there a way to convert a map image layer to a .png/.jpeg file?

I am trying to host a map image layer (ArcGIS map service file) on an Amazon Web Service map. I want to reference this in an Amazon Location Services app that I'm creating for my coworkers. My theory ...
George's user avatar
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34 views

How to make DeckGL-like 3D columnLayer map at country level in QGIS or Illustrator?

I have data for a series of points around the continental U.S. Using deck.gl, I can turn this point data into a nice 3D ColumnLayer map. Now I'm trying to find a way to make a similar map, but for ...
Kirkman14's user avatar
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QGIS Layout - Map Frame shows only white and is not accessible

I created a working atlas series in the print composer. After some time the map frame is all white and showing no map, even with disabling the atlas preview. It's impossible to access the map frame ...
Martin Reger's user avatar
1 vote
1 answer
140 views

Cannot plot geometry on a CSV file (Python)

I'm trying to plot a data about Istanbul's metro lines. The actual data is in CSV format and all of the data is in string. The data is from Istanbul Metropolitan Municipality (https://data.ibb.gov.tr/...
Hilmi Emre's user avatar
-2 votes
1 answer
80 views

Why do only points appear when I load shapefiles into QGIS?

I was sent files in these formats : .cpg, .dbf, .prj, .sbn, .sbx, .shp, and .shx. I tried importing the zipped file containing all of them using Layer > Add Layer > Add Vector Layer and ...
Elyse's user avatar
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19 views

Spatial relationship between fast ice and frazil ice using heat maps

I used Google Earth Engine to create heat maps for both frazil ice frequency and fast ice frequency. This was done by classifying these ice types from MODIS images along the Victoria Land Coast in ...
Daniel's user avatar
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38 views

How to display on a final map the scale of a vector field marker?

I'm using the vector field marker to display earth deformation. For that, I defined the vector field marker with cartesian components (x (field_3) as displacement in West-East and y (field_4) as ...
user238085's user avatar
1 vote
1 answer
108 views

How to enable automatic georeferencing of hand drawn lines

Our company does a lot of bird surveys, we often need to draw flight patterns on a paper maps and convert these lines into shapefiles to create digital maps (e.g. of migration routes) for our reports. ...
chente's user avatar
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2 votes
1 answer
242 views

Transparent but outlined layer in Google Earth Engine

My original code creates red boxes over my study area: Map.addLayer(geometry, {color: 'FF0000'}); I would like for these boxes to have a transparent fill and clear borders. I have tried this based on ...
Macall Hock's user avatar
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20 views

Change the SRC of a Google map (quick map services)

I´m defining a watershed basin using QGIS. I have to migrate the data I collected on QGIS to a third part Application. All transfer of data is doing through DXF files. I use the quick map services to ...
Rabelo's user avatar
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1 vote
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178 views

Applying temporal water masks to temporal Landsat composites

My goal is to create monthly water masks using an NDWI index with Landsat. Additionally, the code should allow a user to select their own temporal window, but in this case the goal is monthly. In ...
pbaltezar's user avatar
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70 views

Drawing a polygon from UTM coordinates without using a computer

all. I'm having trouble remembering how I used to do something, and I can't find any answers so far online. Years ago, I would take various points of, say, a field using a handheld GPS. I would then ...
 Liston1664's user avatar
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61 views

New Zealand satellite imagery Google Earth Engine

I want to create a satellite image for all of New Zealand using 2020 Landsat 8 satellite imagery to then calculate NDVI to export into QGIS. I am wanting to compare to 1990 satellite imagery so want ...
Aimee Calkin's user avatar
1 vote
0 answers
27 views

How to remove Geonode Mapstore Viewer Plugins

I have been trying to remove the "Print" plugin from the map_viewer page by overriding the localConfig.json in the _geonode_config.html file.(See Attached). After I remove it, a couple of ...
David Tshamussa's user avatar
0 votes
1 answer
111 views

Layer Partly missing after zoom in the map and download from Google Earth Engine [closed]

I want to calculate DpRVIc (a kind of vegetation index) by using the Sentinel-1 data on Google Earth Engine. I successfully done my calculation and added the layer to the map on GEE website. However, ...
HsunHung Chu's user avatar
2 votes
1 answer
143 views

Basemap rotation - keeping labels facing down

I'm using QGIS Hannover 3.16.3. I often use Google basemap layers from the XYZ tiles. When rotating the maps the place names rotate with them. Is there a way of stopping this? Perhaps an alternative ...
Tom 's user avatar
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1 answer
78 views

How to extract also a zip code with Overpass turbo?

I use this code in Overpass turbo: [out:csv(comune, ISTAT, name, highway, ::lat,::lon;false;";")][timeout:600]; //provincia da cui estrarre i dati area[boundary=administrative]["...
user236223's user avatar
2 votes
0 answers
29 views

Extracting picture of certain elevation from ETOPO .tiff file

I started learning QGIS a week ago to do an alt-geo map and .tiff files from what I have read contain several image files displayed as 1. Is there a way for me to export specifically the PNG that ...
The Great One's user avatar
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0 answers
220 views

Speed up loading large GeoJSON layers to Leaflet map?

I have some GeoJSON data layers which I fetch their features from phpMyAdmin to display on a Leaflet map. But loading the features takes almost 10 seconds to be loaded. Have you any solution to speed ...
Solmaz's user avatar
  • 149
2 votes
1 answer
45 views

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 ...
Martin's user avatar
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1 vote
1 answer
94 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 ...
Andrea Fontana's user avatar
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0 answers
25 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? ...
Sylvino's user avatar
  • 105
1 vote
0 answers
36 views

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 ...
ttamba's user avatar
  • 141
2 votes
1 answer
141 views

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 ...
starski's user avatar
  • 161
0 votes
0 answers
76 views

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 ...
Ben's user avatar
  • 1
2 votes
1 answer
136 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 ...
Nico's user avatar
  • 23
0 votes
1 answer
141 views

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 ...
Aurélien Lengrand's user avatar
3 votes
2 answers
200 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 ...
ysfgdr's user avatar
  • 31
0 votes
0 answers
42 views

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 ...
empgis2023's user avatar
0 votes
0 answers
70 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 ...
Juan Luis Gómez González's user avatar

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