Questions tagged [mapping]

The act or process of making a map.

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Create Extent to use in mapView.goto

I would like to use the goTo() method of the mapview, and pass it an Extent that I construct in the code. I created the extent by: const extent = new Esri.Extent({ xmax: maxX, xmin: minX, ...
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Edit polygon - QGIS - remove a line or space in middle of merged polygon

I am editing a map using QGIS. Here my steps 1. Select multiple polygons 2. Merge them into one new polygon Question: How can I remove those line (in blue circle) and one polygon fully cover the ...
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Scaling problem when projected map is overlaid on basemap in QGIS

The problem My georeferenced and projected Matplotlib map overlays with an offset on a basemap projected in QGIS with the same coordinate reference system. What I did: I created a map in Matplotlib ...
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1 answer
79 views

Google Maps not being quite top-down in QGIS

I am quite new to QGIS, but am using it for utility mapping at work. I have added a google maps layer to my QGIS project via http://mt0.google.com/vt/lyrs=s&hl=en&x={x}&y={y}&z={z} and ...
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1 vote
1 answer
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Retrieve scale-value of a specific map in specific print-layout for using this scale in model-builder

I made a model with the model-builder which create a grid with its height- and width-size dependend on the size of a certain map in a certain print-layout. It allready works fine. But that for I need ...
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1 answer
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Creating symbology based on range of values in QGIS

I would like to create a map in QGIS 3.16.13 where I am able to distinguish between forest cover increase, decrease, and stable forest. My values are between -99 and 100. How do I create a colouring ...
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3 votes
1 answer
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Delete specific values for contour lines in an attribute table for deletion in line data with QGIS

Issue: I have an attribute table showing contour lines for both bathymetric and terrestrial data. As my study is entirely focused on the marine environment, I would only like my maps to show the ...
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How to color lakes and districts in GADM maps?

This might be a trivial question for regular users but I still couldn't find a quick and easy answer. I'm trying to create a map of Uganda in R using data retrieved using the getData("GADM", ...
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2 answers
69 views

How to remove the cells are zero or null from the map

I want to remove empty cells to obtain a map map like (b) from the above map (a). Do you know a simple way to do it?
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1 vote
1 answer
34 views

Take information from point along coast and make it inland

I'm trying to create a map in ArcGIS Pro using the National Coastal Erosion Risk Mapping Dataset. The dataset shows the likely amount of erosion (metres) at each point along today's UK coastline. I'm ...
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3 votes
1 answer
67 views

The layer does not appear

My task was to upload a CSV file to QGIS. The CSV contains location data. When I load a layer, what happens is that a layer appears that contains the correct attribute table, but the points don't ...
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ee.List map function, using value to filter ee.Featureset

I am converting the image into a vector, but because it might return more that 5000 features I want to union all the features that have the same elevation property. I run the following code, but the ...
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Mapping data >1 standard deviation from mean

I have several geoTIFF files generated by Google Earth Engine (GEE) from Landsat 8 scenes. Each file covers 100Km^2, with each pixel covering 30m^2 and containing a calculated value of Land Surface ...
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D3.js globe view data visualization

I am using D3.js globe view as in the code penhttps://codepen.io/EleftheriaBatsou/pen/VQxdVY?editors=1000 India map that is in the globe view widget is not same as the one while verifying the globe in ...
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How can I use "spline" or Interpolation on a UK Map? [closed]

Basically, I have a number of data across a number of UK cities (London, Aberdeen, Birmingham, etc.). I want to plot them onto a map and then use something like a "contour map" to get ...
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2 votes
1 answer
106 views

Turf.js lineIntersect() not giving intersection of lineString and feature?

I'm displaying some polygons in Leaflet, and using Turf JS to do some calculating. After drawing a line between the centroids of two neighboring polygons, I want to find the intersection of the line ...
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1 answer
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Automatically move overlapping labels from multiple layers and features

So I am currently making a overview of a water system including manholes and pipelines. However, in some situations the parts are so small that the labels are overlapping. (see picture below) I tried ...
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1 answer
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Indexing DB data using MVT Indices

I have a dataset of ~5M records that I want to be able to filter and display dynamically on a map in a web application. Based on When to use GiST and when to use SP-GiST index? I have used a few ...
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using gdal to merge Sentinel 5p projected tiff files without the overlapping at borders?

I have used gdalwarp for extracting Sentinel 5p L2__AER_AI data product to 14 tiff files in EPSG:4326 CRS. These projected tiff files can be gotten from https://drive.google.com/drive/folders/1AHuH6n-...
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2 answers
77 views

Mapping using R

I have a dataset of 152,000 points in the NYC area. I've been having a hard time trying to build a plot of them in RStudio. This is the data I'm working with. I've already dropped the location data ...
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3 votes
1 answer
57 views

Creating Raster Map including if condition in QGIS

I have two habitat suitability maps for one species. One current map and one map for 2050 under climate change. Based on these two maps I created a change in habitat suitability map (by subtracting ...
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Google map integration with existing GIS Map using OpenLayers 2

I am using OpenLayers 2 to show the different layers on GIS map as TMS Layer. My projection is new OpenLayers.Projection("EPSG:32643"), units:"m",. Now my requirement is to show ...
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2 votes
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Setting page margins for SVG map export in QGIS Print Composer

Is there a way to setup the print composer so that when you export your map to SVG it cuts everything that's out of the page margins? Everytime I export my map to SVG (my page is 240x180mm), when i ...
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1 vote
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Polygon of exact size in QGIS, Cartesian vs Ellipsoidal

I'd like to have a polygon representing 400x400km for Moscow and Omsk. I set the size via Advanced Digitizing toolbar. When I tried to measure the polygon, Cartesian is alright, but Ellipsoidal is off....
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1 vote
1 answer
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Exporting exact map size in QGIS Print layout

I'm having a hard time finding out how to export an image with the exact size of my map. I'd like to have exactly 400x400km map of several towns in Russia, e.g. Moscow, Kazan, Omsk. I have 40x40cm ...
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1 vote
1 answer
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Adding popup with attribute characteristics to features in Leaflet?

I need to show popup for GEOJSON data with its attributes. However, I don't have any idea on showing popup for GEOJSON data added through url of wfs. The geojson data is earthquake data added through ...
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1 vote
1 answer
135 views

Google Earth Engine chooses different CRS for different days

I'm using Google Earth Engine (GEE) with Python API. I have this polygon: {"type":"FeatureCollection","features":[{"type":"Feature","properties&...
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161 views

Only a part of the shapefile plotted with ggplot2 in R

I would like to plot shapefiles from the EUFORGEN website (http://www.euforgen.org/) in R (European beech and Scots pine). At first I had problems, because they are files with holes. I was able to ...
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-2 votes
1 answer
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Acquiring clear population density map

These images show the population density in every square unit. What I want is a map with the values of population density paired to a colour, like these. However, these maps are not pixel-perfect: ...
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Unable to trigger event of components on map OpenLayers

I'm new to Openlayers, currently have a ReactJS project that used OpenLayers for displaying maps. When users are in the map component, They can click on any address (coordinate) in the map to fetch ...
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1 vote
1 answer
66 views

Crop map by color

I digitized a map using QGIS. What I have right now is simply the geolocated version of the picture below (including labels, streets, lakes etc.), i.e. the file does not have any layers or attributes. ...
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How can I access the WMS address at this address?

How can I access the WMS tile map address at this address? https://adres.nvi.gov.tr/Proxy/MapServer/export?F=image&FORMAT=PNG8&TRANSPARENT=true&SIZE=772%2C948&BBOX=3646477.6363953245%...
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1 answer
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Can PPK (NOT RTK) be done with any mapping drone?

If PPK is by definition post processed and does not require a live connection to the base-station, why wouldn’t be possible to use any drone and post process the resulting coordinate data (assuming ...
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1 vote
2 answers
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How to add GPS points from a CSV/Excel file to a QGIS project? [duplicate]

I thought I knew QGIS quite a bit by now, but a straight forward simple task recently brought me close to frustration. I had collected the GPS coordinates of points using my cellphone in an Excel ...
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1 vote
1 answer
32 views

Interactive World Map with leader names of each country and administrative division

Is there any interactive World Map with country leaders, also the administrative divisions? Starting with presidents/heads of state and prime ministers and all the way down to town mayors. In usual ...
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4 votes
3 answers
150 views

Set grid position behind map in print layout QGIS

I have created a map in the print layout in QGIS. Once the coordinate grids are added to the map, they overlay the current map that I actually want to show. For me, grids are just secondary ...
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Improve ALOS World 3D vertical precision with GPS data from fieldwork

I'm working on sport topo maps in Russia, european part (Pskov region, near Estonia/Latvia border), typical map is from 1 to 10 km2 in size. The most precise source of DEM for generating relief lines ...
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Soil organic carbon datasets

I am analyzing soil organic carbon stocks for several states in the US. I am interested in data sources (free or paid at this point). I have checked some freely available sources of data, including ...
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-1 votes
2 answers
93 views

Where to find the WKT of a particular co-ordinate system

I'm using ProjNet in my C# application for coordinate conversion that requires WKT of source and target co-ordinate systems. I have googled but didn't find the WKT of MGA2020 Zone 46 [EPSG 7846], ...
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1 answer
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Importing cmap file in QGIS

I have a cmap file that I want to import in QGIS and use as the color ramp for my map layer. How do I do this?
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1 vote
0 answers
73 views

How To Set QGIS Map Units To Inches/Imperial?

I'm trying to recreate QGIS-equivalents of ArcMap/ArcGIS Pro maps originally created in inches/imperial units. I wish to retain the same units for the QGIS maps but have run into problems. I can't ...
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2 votes
1 answer
41 views

Average depth of linear features in QGIS

I have a shapefile with some linear features that I have drawn on the seafloor with QGIS. How can I calculate the depth of these in the field calculator (or another place)? I am looking for the ...
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0 votes
1 answer
57 views

Trying to find a map, of the London underground/tube which shows where lines run underground vs overground [closed]

I'm trying to find a map, of the London underground/tube which shows where lines run underground vs overground. Seems a bit of a tricky one to find as when including the word overground in Google its ...
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1 vote
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Symbology on joined variables not showing up on map in QGIS

I am trying to add a certain styling to points I have on the map. I have set a Rule-based styling with a range added based on a different variable. Both variables were added to the point DB from a ...
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1 vote
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How to show attribution above Bing max zoom level where allow tile image stretching?

Currently some of location Bing provide image for stretch after crossing max zoom level 21 as per Bing metadata. Wanted to show attribution above max level where Bing tiles able to stretch it out. My ...
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2 votes
1 answer
143 views

Creating Density Map using Hexagonal Grids in QGIS

I have residential density (number of dwellings/area) data for several areas. I want to create a density map using hexagonal grids. I have extracted the hexagonal grids according to the area extent ...
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0 answers
26 views

How do I change from degrees to metres on my map grid? [duplicate]

I have changed the CRS to GDA94/MGA zone 50 but still when I create a new grid it displays in degrees. I cant find the 'on the fly' check box on my version of QGIS so I cant follow the instructions to ...
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0 votes
1 answer
82 views

Stream GPS coordinates using D3 and Mapbox

I’m currently working on a project to stream GeoJSON data using D3 and Mapbox. But, I wasn’t able to plot my data based on their types. Basically, I have three different types of GPS data, when using ...
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1 vote
2 answers
116 views

Is there opensource data pipeline which can be used for updating vector tiles according to new commits?

We currently have different open source components like for Tile server->https://github.com/TileStache/TileStache Styling and rendering->https://github.com/mapbox/mapbox-gl-js OSM to Postgres ...
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1 vote
1 answer
96 views

Creating dynamic map scale in FME

Is there a way to generate a dynamic map scale for my dataset so that when I create a PDF map, I can create several PDFs at different scales (based on the size of the feature) at once? For example, ...
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