Questions tagged [mapping]

The act or process of making a map.

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2answers
25 views

QGIS 3.16 - I want to make by 6“x9” map a 24x36, but all of the text/layers are tiny. Is it possible to automatically scale all of the layers?

I recently got a freelancing gig and am really excited, but I'm having troubles exporting my map in a different size in QGIS. My client wants a map sized 24"x36", and I have created one that'...
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19 views

Display error when uploading images to google earth engine

I am adding square images (1024x1024 pixel, left image) from the xbd dataset (a disaster dataset comprising of satellite images) to the google earth engine. When displaying them they are shown as a ...
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0answers
14 views

Store and use compass and dip with QField

We will be using QField for structural measurement and geological mapping. Tablet and cell phone can measure plane orientation and dip. How can we set-up these measurement with QField?
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1answer
36 views

Adding labels after meeting a zoom threshold in Leaflet

I'm making a map in Leaflet and I have up to two labels per marker: var redIcon = new L.Icon({ iconUrl: 'https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-2x-red....
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13 views

Problem with Python code to visualize a map in the geospatial analysis

You can download relevant files to execute my python code as below: https://drive.google.com/drive/folders/1WmkZ9t3RnAsd4Dy83TRdjWIsAdby4IwI I want to visualize data at the postal code level with ...
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21 views

SVG tile interactivity with vue leaflet

I am not being able to extract or interact with the svg tiles data on mouse hover/click using leaflet. I have a tile server that serves svg tiles eg:https://sometileserver.com/roads/{z}/{x}/{y}.svg, ...
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1answer
24 views

GeoJSON map color does not change

I am trying to code save/load function. I can say my save and load function works properly because it displays on console that for example when I load "Canada" file from database, it shows ...
1
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1answer
34 views

Correct way to stop Leaflet Map propagation

What is the correct use of the Leaflet stopPropagation? I have a canvas map drawn with some custom png markers. That works great, but when they are clicked, both the marker and map click events are ...
1
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1answer
50 views

Simplify raster size to plot using ggplot geom_raster()

I want to create a map using 'ggplot2'. My data contains shapefile (points data), polygons (European countries). Underneath the vector data, I wanted to place the raster showing extends of forests ...
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1answer
28 views

Subtracting point values from raster maps in QGIS

I have point values (x,y,z) and a raster map with z-values. I would like to subtract the z-values of the raster map from the z-values of the points. The resulting data has to be point data (x of point ...
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0answers
32 views

WMS layer not working in OpenLayers (Geoportal)

I tried to implement layers in WMS format in openlayers 6. This layer comes from the Geoportal of the Emilia Romagna region, but I cannot see it on the map. This is the code: HTML: <!doctype html&...
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1answer
35 views

OpenLayers Vector Tile Info

I've created a map and I am using Openlayers Vector Tile Info example https://openlayers.org/en/latest/examples/vector-tile-info.html to retrieve the point information from GeoServer. My code is as ...
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1answer
25 views

How to copy a legend in QGIS map layout?

I am creating a map where I have many legend items. Initially, I divided them into two columns but now I want to separate them. When they were together I have customised font size, style etc. I can ...
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0answers
9 views

Language Translation: map outputs to XLIFF or similar for the purpose of translation

A series of maps that i'll be producing with English text and labels will need to be sent to a certified translator. I'll be exporting the maps from GIS as PDF format. When the output PDFs were sent ...
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1answer
42 views

Why mapping a GeoTIFF world map in QGIS at low zoom level (0~2) results in a strange behavior?

I have created a GeoTIFF world map, but I notice that it cannot be rendered correctly at zoom level which are low (e.g. zoom level 0, 1, 2). Is it a predicted behavior or how can I fix this? I also ...
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2answers
273 views

How to format latitude and Longitude labels to show only degrees with suffix without any decimal or minutes?

I am setting my latitude and longitude labels in the QGIS map > map grid properties > draw coordinates > format but this only has decimal, decimal with suffix, degree minutes (w and w/o ...
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1answer
44 views

Leaflet geolocation alternative for if access is denied [closed]

I have the following that prompts the user to give location access. On granting permission the user's location is shown and the map loads. I'm trying to find a solution for if the user accidentally ...
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0answers
27 views

Failure to use a WMS map as a map background in Geonode

I try to add a new background to a map, so that user can choose from more options than the default ones. The default map backgrounds are defined as follows: DEFAULT_MS2_BACKGROUNDS = [ { &...
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1answer
23 views

Showing a study area in a map [closed]

I have my study area as a raster file and I want to show it on a much bigger map in R. I can show it using the « plot » of the raster file but at this point, I can’t see it inside a map. Is there any ...
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1answer
66 views

Plotting on map Leaflet when I GeoJSON that comes polygon and mutipolygon (in the same JSON) [duplicate]

I have a GeoJSON that comes with polygon and multipolygon geometry types. Can I plot it on the map anyway, or would it have to be different APIs? And if possible, how would I manage to do that? I have ...
3
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1answer
120 views

Matplotlib skip color for assigned interval in map plotted from GeoPandas DataFrame, if attribute don't have value in range of user defined bins

I have a GeoPandas GeoDataFrame which I am plotting against a specific column and the colour of the output/map is same for different assigned bins/intervals. The issue is because, sometimes, there is ...
2
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1answer
60 views

Legend colour not matching as assigned in the bins in matplotlib map plotted from GeoPandas DataFrame

I have a GeoPandas GeoDataFrame which I am plotting against a specific column and the colour of the output/map is not matching with the colour assigned to different bins/intervals. It should ideally ...
5
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1answer
93 views

Removing NaN value from legend in matplotlib map plotted from GeoPandas DataFrame

I have a GeoPandas GeoDataFrame which I want to plot against a specific column. for day in days_list: df2 = csv_file[["state_id", "state_name", "tmx_corrl"]].loc[...
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0answers
19 views

Automate publishing to Map Server

I recently been using FME to publish feature layers but have now had to move to map image layers because of the issue around grouping limitations with feature layers. I am now trying to work out how ...
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0answers
56 views

Point pattern analysis in R

I am quite new to R and am having some trouble setting up my data for some point pattern analysis. What I want to do: conduct a point pattern analysis on NYC arrest data and see if there exists a ...
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0answers
11 views

Map Lagging on Drag and Drop Movement

am working on Angular 11 project having arcgis javascript version 4.17 when doing Drag and Drop on the map it self by the mouse, there is a kind of lagging that happens on it. the movement is not ...
2
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1answer
68 views

Putting different id in different paths on my Leaflet map

I have many polygons to display on map like this: L.geoJSON(polygon, { style: function (feature) { return { stroke: true, fillColor: feature.color, ...
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1answer
89 views

Problems with specifiying TM_fill when creating a map in R with TM_maps

For my research I am visualizing plastic contents in segments of water. After creating my segment (online, polygons in KML-file) I jointed it with my table with fieldworkdata with plastics per segment....
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1answer
41 views

Interactive map where users can import, transform and export their own layer

I started to create an interactive map with React and Leaflet. I would like to add a sidebars where user of the map can import, display on the map, edit and export their own layer. Basically, it would ...
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0answers
40 views

How to get a segment between two points

I have a map made of two layers, the first is a list of trails (path) and the second is a point based layer (different intersection between the trails). I am looking for a way to select a segment ...
1
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1answer
32 views

Python code error when reloading map

I'm receiving a Python Error when i try to reload a map i am working on, anyone with an idea how to solve this? WARNING Traceback (most recent call last): File "C:/Users/Helfer/...
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0answers
42 views

Plotting city locations on Python 3 [closed]

My question is a follow-up of this: plotting US cities on a map with matplotlib and basemap. I would like to use some Python library to plot on a map city locations, starting from a list like this: ...
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0answers
21 views

Way to turn on a layer, and turn off the rest of the desired layers with a button or switch in Experience Builder?

I am attempting to publish a map in Experience Builder that has indoor floorplans of buildings. Would anyone know of a way to design a button or a switch that could toggle on a layer, and then turn ...
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1answer
42 views

Querying a database/REST API

I cannot figure out how to use QGIS to query the database at this link: https://www.ncdc.noaa.gov/swdiws
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1answer
34 views

Cumulative Rainfall with GPM between dates

I am trying to generate a cumulative rainfall map between two dates using the GSMaP satellite. I don't know how to do the simple sum of the information in that band "hourlyPrecipRate". ...
5
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1answer
120 views

Understanding EPSG in WKT

I notice several EPSG codes in one WKT. At the first glance it almost is non-intuitive to see so many EPSG codes linked to a single EPSG. Can someone explain each line of the following WKTs for EPSG:...
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0answers
47 views

How do I accurately resize a map to match the scale of the next map I want to build a bigger map from?

I have exported a group of maps that I want to tile together in Illustrator. Since the maps are not of the same scale I tried calculating the factors between each scale to the largest number of map ...
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2answers
98 views

Creating bathymetry maps using sonar data in SAGA

I am a geologist, however somewhat of a newbie to GIS. As a personal project, I am looking to create some bathymetric maps of some local fishing lakes. I am looking to do this using free open source ...
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0answers
31 views

Overlaying Map QGIS 3 (oblique secant cylindrical projection)

I am trying to overlay a heightmap of Canada (EPSG:3857) with an old map scan I have (https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fulle.web&search1=R=294063). The ...
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2answers
89 views

Determining CRS for contoured road map of England and Wales

I've been working with some old maps lately [1800-present] and I've had some difficulty identifying CRS/projection. This map has this written at the bottom. Based off of this, how can I find what ...
2
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0answers
37 views

Multiple Text rows in QGIS divided by lines

My Problem seems rather simple but I had no sucess for over a day now. Basically I have multiple (polygon) shape files that need text information in them (or if the shape is to small outside of it ...
2
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0answers
29 views

Altimetric image with blank space when merging

I have downloaded some tiff images that has altimetric data from the Brazilian SRTM website: where i am using raster layers to apply merging. However, i have some problems with my merged images, a ...
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0answers
17 views

Exporting map from multiple .gpx files and georeference .tif

I have a .pdf trail map of the Red River Gorge (RRG), that I got from fs.usda.gov (36x36 Map at bottom of the page) Have georeference map, saved as .tif, works great with Avenza! I would like to add ...
2
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2answers
139 views

Tools for drawing weather-rose-overlays on maps/locations [closed]

I need to create a map with points-of-interest. My initial idea is to "build" wind-roses using KML file and Openlayers: https://openlayers.org/en/latest/examples/kml.html. This seem a bit ...
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0answers
32 views

How to copy the location of these markers on a website Google map?

I want to know the location coordinates of all those points in order to put them in GIS software. (QGIS) Is there an easy way to do it? This is the website: https://www.ah.nl/suppliers/map
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0answers
34 views

How can I load and draw predefined chart images (diagrams) rule based and related to a point vector layer with QGIS

I have a bunch of diagrams for a set of route segments, stored as PNG, PDF or SVG with a regular name (topic-segment-id.(png|pdf|svg) for example), representing a certain aspect (like crossing rate or ...
3
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1answer
105 views

Scale bar in QGIS shows incorrect measurements

I am mapping change in share of land used for agricultural use by nation. For some reason when I add the scale bar it displays incorrect measurements (see screenshot attached. I am pretty sure the ...
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0answers
16 views

Plot something on lat long in PHP

Is there some sort of plotting system which lets you do this? (in PHP): ex. plot(lat,long,data_show_onhover) My CSV file that I want to plot on the map looks like this: something,something,something,...
3
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0answers
49 views

Symbolize thousands of polygons to identify similar geometries

I would like to categorize polygons with a similar enough geometry so such similarities can identified at a city-wide scale. I'm trying to identify if street layout is a useful spatial characteristic ...
0
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1answer
63 views

Export a map and a legend as a PNG with OpenLayers 6

I would like to export a map with a legend in the same PNG using OpenLayers 6. I searched in the OpenLayers documentation but I got just how to export a map (without a legend). How can I do this?

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