Questions tagged [maps]
A visual representation of an area-a symbolic depiction highlighting relationships between elements of that space such as objects, regions, and themes
341
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Validating raster soil map through independent point set of soil attributes
If I have a raster map of pH, and a point (vector) dataset of map independent pH measurements, then how can I validate the accuracy of the existing raster with these extra measurements?
I don't have ...
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25
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Which coords fall into my grid
I have data of locations, co-ordinates, and covariate values associated. I want to aggregate multiple locations into grids and then calculate the mean sum of covariates in each grid. I importantly ...
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QGIS: georeference a jpeg map working on avenza maps app
I am trying to georeference a map on QGIS. I used this video to teach me how to do it, https://www.youtube.com/watch?v=jKLBFddpTGI. I found it fairly easy to do. I do use WGS84, that was the first ...
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Save Google image as map with a point location dropped on it using a coordinate
I have saved a Google map image (PNG) using coordinates in Python. Now, I want to mark a location(as a coloured dot) of that coordinate on the map and save the same image. Are there any options ...
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Issue with terra::mask
I try to mask the mapenter image description here in the rectangles with the borders of Switzerland.
str(swissmask)
S4 class 'SpatVector' [package "terra"]
> swissmask
class : ...
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GADM shapefile former countries
I am looking for country shapefiles of former countries (i.e. USSR, Sudan, Yugoslavia, Ethiopia, Czechoslovakia, Netherlands Antilles) - ideally WGS84. Does anyone know if GADM or any other website ...
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How could I replace fixed conditions to get clustering EPS for some calculation?
I use a function of DBSCAN for clustering, that takes the EPS value as a parameter (radius that defines which points will be grouped together).
To set the EPS I use the following switch case:
let ...
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71
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Markers are not showing on min resolution
Working with Openlayer 6, my map is working fine for the 40 layers on initial load. Against search functionality, I am trying to add a new layer on the map using the following code.
const ...
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1
answer
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Internationalizing a map in QGIS
I am working on a map of a city in Cambodia. Unfortunately, the characters and names of nearly all places are all displayed in Khmer, which, despite being able to speak, I am not able to read.
I ...
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680
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How to remove a marker from a Leaflet map?
I'm currently making a website where I'm using Leaflet 1.7.1 and Nominatim API and VueJS 3 and I'm trying to delete the marker after I search an address. When I search the address the first time ...
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Build a project that reports if a point is inside a restricted area
I want to build a project that can accuse if a point is inside a restricted area or not. For this I have to use an map with restricted areas already delimited by layers and the entry point is a ...
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How to produce a gridded map in R where each grid cell represents the sum of points occurring in the grid?
I want to produce a gridded map where each grid cell represents the sum of points falling within the grid using R. I have seen similar questions for R here, here, and here for Phyton. But could not ...
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How do I make a small box similar to the one in the attached picture with a full view of an area?
So I have one area that's been split into 7 layouts, how do I make a similar full layout view as show in the attached picture?
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152
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I need a formula to calculate gml:pos to standard GPS coordinates
I downloaded "address points" data from geoportal and the coordinates are not readable for me.
<wfs:member>
<ms:prg-adresy>
<gml:boundedBy>
<gml:Envelope ...
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Trouble overlaying plots in R
I've produced a raster using IDW to make predictions across California, and now I'm trying to overlay the raster image with the border/shapefile of California.
I've ensured the CRS projections are the ...
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Projection: Mollweide to Equirectangular
I am trying to reproduce in Python a coordinate transformation of a map from Mollweide coordinates (see Figure A) to Equirectangular coordinates (see Figure B) that I saw done in Mathematica in the ...
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753
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Using Folium.DivIcon to plot multiple LineStrings Length on 1 map
I have the following GeoDataFrame "melissa_segs" which is a result of an exploded Polygon and CRS is 'ESRI:102009'
poly_id
vertex_id
seg_length
geometry
0
1
103.0
LINESTRING (-1224668.715 ...
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1
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417
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Saving a map from a new print layout pane in QGIS
I have created a map with different layers, labels, scale bars, a north arrow, a legend, an overview pane, and other modifications. It took a long time to produce this map within the 'New Print Layout'...
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can lat long of a place could have different precision from google maps [duplicate]
When I select for lat long in google maps I could see the precision after decimal places are same for both,
for an instance a place could have [12.941963598406998 {15} , 77.60827701942743 {15 ]( both ...
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814
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Color osmnx map by place (using graph_from_place() method)
Let's say we want to graph the two below villages, which are in the UK. We also want to colour the streets by length. We can do:
# Get data
import osmnx as ox
place = ["Broughton Hackett", &...
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177
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Improving resolution of map using QGIS
I am using QGIS.
I have a shapefile of Africa. In that shapefile I divide Africa in cells. After, I graduate all the cells according to one variable (see first picture). I would like to see the entire ...
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267
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Calculate growing degree days using NetCDF file in R [closed]
I have a NetCDF file containing temperature values over a certain region from 1984 - 1985, with 1-hour intervals, so that means that I have 17544 maps. I need to do two things and I got a bit stuck ...
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Setting Dark Mode for WMS in QGIS
I want to implement a OSM into QGIS via an WMS service. We see that this is easy, right? I thought so too. In my case I want to implement a night mode map, like you would find in Google Maps when you ...
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815
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Setting map view with 50 miles of radius of marker with mapbox
I have a mapbox map with a marker and I want to add a radius around it, say 10 miles.
Now I can add a circle to the map, even though I do not want to, but I cannot get it to fit the screen. I have ...
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177
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OS Maps API – WMTS map (EPSG:27700), Point and Route layers fail to draw
Can anyone help a Nube? I'm learning OpenLayers using OS Maps. I am using WMTS(EPSG:27700) projection. The OS map displays, however, point and route layers do not, although I have successfully got ...
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221
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Choosing map projection type for flight plan [closed]
There are two projection of maps that I saw online. UK CAA is a transverse projection map, while ICAO maps are conical.
It seems that transverse map is easier for flight planing as straight lines are ...
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2
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0
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189
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Extract shapefile from scanned PDF map using Open Street Map?
I am new to QGIS. I have a scanned PDF document containing maps of the Italian highway network development year by year from the 1920s to the 1990s (i.e. showing the pre-existent network in a given ...
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243
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ArcGIS Pro: where does arcpy reference map order?
Problem: In an ArcGIS Pro 2.8 Notebook, how is python reading the map order? I have to know this because when I use a list the items in that list are based off the order of the maps. When that order ...
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159
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Matching polygons with many points using QGIS
I'm building distribution maps for several species in QGIS but I've been struggling to match the country borders with the lines of the distribution maps.
As you can see in the next picture, both ...
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217
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How in QGIS to place the signature of the latitude and longitude of the map corner in the layout?
It must be done as in the example.
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343
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Standard deviation map shows pixels as null in GEE
I need some help in understanding image reducing with kernels.
I have a code that generates a band of NDVI stdDev 3X3 kernel. When I map the layer the outcome is an image with empty pixels with a ...
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2
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67
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Digitizing photographs of a map
Is it possible to digitize the photographs of very old maps, having no co-ordinates. The photographs are exactly like this. If possible, could somebody tell me how to proceed? I have access to ArcGIS ...
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325
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Customizing Layer Display in Map based on Nested Criteria selection with dropdown field outside the Map
I have about 5 different polygon map layers on a map. Each map layer data is stored as separate JSON file (Eg: continent1.json, continent2.json, ...... continent5.json). Every layer have its own ...
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1
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142
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How do I find the geographic mean of a multipoint feature in QGIS?
I'm trying to find the geographic mean of the multipoint feature in the above image. It seems like a really simple command, but I cannot find any way to do it.
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Can I add 3d models on maps in QGIS?
I need to overlay 3D models of buildings I have designed in a separate CAD software. I want to add .stl or .obj files with proper scaling on the 2D map on qgis so that I can make a 3D map with 2D base ...
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What is the way to calculate center possitions from WKT format POLYGON?
I have a polygon, for exapmle
`POLYGON((
4977994.67879995 5126870.48124117,
4977998.08163505 5126894.51511692,
4978000.17683601 5126902.67634682,
4978001.98260158 5126910.54986973, ...
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164
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Earth Engine coordinates in a map
I am beginner and I'm having troubles to do what I want in Earth Engine.
I want to put the coordinates under the map, like this:
I already made the layer, but I don't know how to put the coordinates ...
4
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2
answers
1k
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How to know if a point is on linestring or near one (<0.01units) using GeoPandas
I want to know if a point intersects/touches/on the line/linestring or if the point is less than 0.01 mts (units) from linestring.
import geopandas as gpd
import matplotlib.pyplot as plt
lines_gdf = ...
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Select area in Maps and get List of all Addresses
I am looking for a way to select a residential subdivision online maps and get a list of all addresses in that selection. What do you think?
I think this thread might lead in the direction of what I ...
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25
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Place marker on map - GeoTools 25-SNAPSHOT - Java 11 [duplicate]
I am using GeoTools 25-SNAPSHOT in my application. I have displayed a map in my application (raster). Now I want to place a marker (image or simple colored dot) on a map at a specific latitude, ...
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Unable to find print composer on QGIS
Anyone have information about where Print Composer is hiding.
I have followed the instructions on the QGIS website which says it is under Projects or the button in the control panel. Neither option is ...
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4k
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Adding different types of marker on the map with using Leaflet.draw
I am using Leafletjs with Leaflet.draw to create an interactive map on my web.
But I need to enable different types of "marker". And then when creating them I need to identify them. I tried ...
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113
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To check if the area within circle radius has any feature of layers from GeoServer
I have used google map to show the WMS layers from the GeoServer. Now what I am trying to do is, I have drawn a circle on a Google map. Whenever I change the radius of the circle I want to check if ...
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How to calculate pixel size on image of map?
I have to save to .png file with part of map from app.
I've got information about PPI, easting/northing, print resolution, map scale and map coordinate system and using this information I have to ...
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What are "degrees" in SRID 4326 and why can't they use meters? [closed]
I want to return all the houses for sale within 500 meters from my own house.
I have this query:
SELECT * FROM houses_for_sale WHERE postgis.ST_DWithin(coordinates, $1, 500);
It returns houses ...
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1
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209
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Altas with different numbers of page and maps for every feature
I want to create an atlas and the features to show are OUTSIDE the feature of the layer coverage.
The atlas feature 1 is Switzerland, but I want to show all embassy that are geographically OUTSIDE ...
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36
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Is there a standard vernacular for levels of political boundaries (specifically city, county, state, nation)
While building a geotemporal web app, I found that virtually all countries followed this simple four-level structure, akin to what we in the US of A call: city, county, state, nation.
However, most ...
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2
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548
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Concept behind longitudes
Why longitudes are not parallel and why do they meet at the poles? What problem would have happened if like latitudes they were parallel circles running from west to east?
I would request the ...
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176
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Showing size of pie chart in legend of ArcMap 10.7.1
I'm using a pie chart map in which the size of the pie chart convey an attribute value (scaled size).
Is it possible to show this classification in the legend of ArcMap 10.7.1 ?
There is a similar ...
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1k
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How to plot postgres data on a map?
I have a table which has latitude, longitude and some sensor data (data 1, data 2,data 3) saved in postgresql 12. I am running the database on ubuntu 18 virtual machine with windows as host. I dont ...
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