Questions tagged [coordinate-system]

A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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State Plane Coordinate system is off in longitude by almost exactly 5 miles?

So I'm doing a simple well location map that involves me taking the coordinates from a table (coordinates that are in New York Long Island State Plane 3104), plugging them into Excel and then using ...
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Raster tif file does not project onto QGIS basemap correctly

Forgive me if this is a simple fix, I am new to QGIS 3.8. I have a .tif file that when opened into QGIS is projected on the (0,0) lat/long coordinate of the base map and is very small. I have ...
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Reprojecting CRS from Geocode API fails to match shapefile CRS

I have a shapefile obtained from this link. library(rgdal) library(rgeos) dir <- tempdir() unzip('~/Downloads/4106902.zip', exdir = paste0(dir, '/4106902')) shape <- readOGR(paste0(dir, '/...
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Area measurements in Google Earth

Since Google Earth works in degrees, how does it perform area measurements? Does it momentarily convert to Cartesian coordinates and if yes by what projection and on which datum? Web Mercator has the ...
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EPSG:25833 in LeafletJs [on hold]

I am currently working on the different coordinate system. Specifically, I am concerned with the correct presentation of EPSG:25833 (ETRS89/UTMZone89) in Leaflet. If I am right Leaflet used as ...
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Importing GeoJSON File

I am dragging and dropping this GeoJSON file into QGIS but for some reason I cannot reproject it from WGS 84 (EPSG:4326). It remains at the original LAT/LONG even in a new project where UTMs are ...
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Mathematical rule to convert between degrees and centimeters based upon projection

I have some Tanzania drone imagery data in a local geographic projection EPSG:32737 that uses the unit of meters. Then I have other vector data that is in EPSG:4326 which is denominated in degrees. In ...
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23 views

Weather system radius [on hold]

I have two lists, locations (lat/longs) and weather stations (lat/longs). I previously posted a question about attempting to find the three closest weather stations surrounding each location. I have ...
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How can to find tolerance in topology?

I am working with Topology plugins in Qgis 3.8, but I don't see tolerance in topology. I hope to get help. I have attach images.
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32 views

Get geographic coordinates based on pixel coordinates?

I'm working with Mask R-CNN to locate fires. I have the following image. I have info about the geographic center coordinates of the image, and the orientation of the image in degrees let's suppose ...
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Reprojecting point data from EPSG:3078 to EPSG:4326

There are services to project from one coordinate system to another, GIS software packages that perform projections, but it is all black box, as far as I've been able to find. I want to see the ...
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Align images with self-defined CRS in Google Earth Engine

I have uploaded a dataset to GEE and I want to align every image in the collection to have the same geographic extent as the first image of this collection. My code so far : var ref_image = ...
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Reprojecting QGIS vector layers problem

Using QGIS 3.8.0. Despite similar questions out there I can't reproject a vector layer to a geopackage while specifying the original table name in a qgis python processing script. FYI all tablenames ...
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Creating rotated local grid/fishnet in QGIS with known AMG origin & rotation angle?

I have a local grid with known origin that is in AMG (metres) and a rotation angle. How do I establish that grid so that it can be projected into known CRS eg GDA94/ MGA Zone projection? I located ...
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What is inertial navigation system? [closed]

I'm tracking the position of a vehicle along a certain trajectory using the Kalman filter and for this, Odometry data is recorded through measurement sensors on vehicle and gives the x-position of the ...
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Longitude and latitude in aviation

I have two coordinates A = (60◦ N, 30◦ E) and B = (60◦ N, 150◦ E). I want to calculate the shortest possible route between these two points and also I want to know how far north does the route goes. ...
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How to make sure that vector and raster data align correctly in ArcGIS?

I have a shapefile of European states (open-access from here: http://tapiquen-sig.jimdo.com) and DEM data downloaded from Copernicus. Europe states vector is in GCS_WGS_1984 (Datum: D_WGS_1984, ...
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Converting local vehicle position coordinates to global vehicle position coordinates [closed]

I'm tracking the position of a vehicle along a certain trajectory using the Kalman filter and the idea is to check for improvements in position estimation through fusion of data from multiple sensors (...
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Break a bounding box into smaller boxes (coordinates)

My objective is to create a collection of bounding box coordinates that I can supply to a search function. The idea is that I have the search function search smaller geographic areas, instead of one ...
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Row-wise Reprojection of SPDF in R [closed]

I have multipolygons that span across the globe. I was wondering if it was possible to re-project each row, i.e. each country/ ISO3 to a local projection, using a central grouping mechanism. For ...
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How do you retrieve image coordinates from Google Earth Engine Geometry?

My aim is to convert latitude/longitude coordinates of a GEE ee.Geometry.Polygon object into image coordinates. The boundaries of the image are given by another polygon. The image itself is a sentinel ...
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28 views

Coordinates transformation from MGI 31276 to WGS84 [closed]

I have a shapefile in MGI 31276/Balkan zone 6, and it doesn't line up with my base map. I try to make transformation from MGI 31276 to WGS 1984 Web Mercator Auxiliary Sphere, but it's impossible, and ...
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Extract GPS coordinates from lines on images [closed]

Say that I have an image of map (or just piece of the map), where between two points X and Y lead red line. An example. The path between two cities, so some body can have nice cycle ride. My ...
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35 views

Unable to convert coordinate format

I am trying to figure out the format of the coordinate pair below. My task is to convert a list of these integer values into decimal degrees (below), but this is my only ground truth data point. ...
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Georeferencing a stack profile graph?

Is there a way to get a georeferenced profile graph from Stack Profile? I have a DSM and use transects to get a profile graph from the DSM. This gives an x,y value between 0 and 300m (the length of ...
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1answer
48 views

Setting CRS on QGIS?

I am just learning how to use QGIS (3.4.1) and am having some issues overlaying some data (CSV file) with a QuickMapServices base map. I feel like this is an issue with the CRS, but am not 100% sure. ...
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Convert gnomonic projection to Mercator

I'm trying for some time to convert a weather radar map (gnomonical projection) to mercator (EPSG_3395) and then layout it onto third-party web map so far unsuccessfully. The original image: The ...
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QGIS Transforming from ETRS89 to WGS84 - why are Helmert parameters 0?

If ETRS89 (EPSG:4258) is tectonically fixed and WGS84 (EPSG:4326) isn't, the Helmert coefficients shouldn't be zero, right? In fact these parameters should diverge more and more with every new release ...
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42 views

Points from WKT File are in Wrong Location [closed]

When I load my WKT file (truncated sample below) into QGIS 3.8, the points load into the wrong location. label,geometry 96962283,POINT(-15.43 28.30) 96963030,POINT(-15.39 28.41) 96963031,POINT(-15....
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1answer
34 views

GeoPandas not projecting from 4326 to a UTM zone properly?

I am at my wit's end trying to figure out why my data is not being reprojected properly in a geodataframe. Given this input data, saved in a variable called power_lines: {'type': 'FeatureCollection',...
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Determining if file in projected or geographic coordinates using ArcGIS Desktop?

I have download the European grid DEM raster data from Copernicus website, which I would like to use to calculate solar radiation for smaller study site. The ArcGIS:Area solar radiation tool requires ...
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Map .pbf CRS in QGIS?

I am trying to learn the Vector Tile Map, and got one pbf file for one tile. I can load it into QGIS, but how can I know the CRS? http://PBFSERVER/13/2411/3080.pbf Update: I am trying to follow ...
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Using gdalwarp, how to first transform and then clip instead of vice-versa?

I have a large number of GeoTiffs that I need to clip by a polygon stored in a shapefile and then save them as a new raster. I use a gdalwarp command which I call from a Python script. These GTiffs (...
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How to convert shapefile into Google Maps-compatible GeoJSON? [duplicate]

I have a shapefile whose Coordinate Reference System's NAD_1983_CORS96_StatePlane_ Florida_East_FIPS_0901_Ft_US/ESRI:103257. How do I convert this shapefile into a .geojson file that can be read onto ...
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327 views

What are the map units that WGS84 uses?

I'm using a tool in QGIS where I'm creating points in a grid and I am specifying the points to be created every 0.5 of the user-defined atlas size. In other words, 0.5 map units of the CRS. What is ...
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1answer
37 views

Changing CRS from Geographic to Projected on vector layer

I am trying to run a Iso-Area as Interpolation (from Point) calculation using QNEAT3 in QGIS 3.8.2. To do so, I need to change the CRS from Geographic to Projected. I did that to my raster layer, but ...
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1answer
21 views

Cesium projection system

I am using the following code var earthPosition = viewer.scene.pickPosition(event.position); the earthPosition object is as follows Cartesian3 :{ x: -2356447.208926279 y: -3743919.310632037 z: ...
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PostGIS: spatial analysis of point layer SRID 4326 using UTM grid

Edited, as suggested. I've got a PostgreSQL/PostGIS table 'Datos' ALTER TABLE datos ADD COLUMN geom GEOMETRY; UPDATE datos SET geom = ST_MakePoint(decimallongitude,decimallatitude); update datos ...
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Calculating Center (GPS Point) and Radius (km) of n GPS points

I'm new to GPS and position mapping but i have a background in programing and some of the math related to it. I've been tasked with writing a small golang program that takes n GPS points (DMS) and ...
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1answer
34 views

Multipolygon in Los Angeles County Parcels Tax Roll

I downloaded the Los Angeles Parcels Tax Roll data into QGIS. I copied the information for a single parcel results in QGIS: wkt_geom OBJECTID_1 AIN Roll_Year AssessorID TaxRateArea ...
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Map reference starting point shifted [duplicate]

I am loading an nc4 raster downloaded from a public dataset to QGIS and it first displays an error that the data does not have CRS. Then, it charges the map but the reference point 0 is shifted the ...
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1answer
49 views

Converting coordinates to lat lon in Madrid?

I am using Python script for accessing this API for getting madrid traffic data. But I am really confused on how to get the geographic coordinates from this data. It has 2 fields st_x and st_y which I ...
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1answer
55 views

What XY coordinate system goes with EGM96 when projecting elevation raster in ArcGIS Pro?

I am using ArcGIS Pro 2.3.1. I have an elevation raster in WGS84 and a national Z coordinate system. I need to project this DEM raster to the EGM96 Z coordinate system. Which XY coordinate system ...
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Drawing ellipses over a tile map server in PyQGIS?

I have a few ellipses, defined by a latitude, longitude, semi-major axis in nautical miles, semi-minor axis in nautical miles, and an orientation. I'm trying to render them over a Google Maps layer. ...
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OpenLayers map with custom projection not showing WMS

Trying to add to my map an WMS layer with custom projection When executing, the map does not show any layer. Custom projection: proj4.defs("EPSG:25830","+proj=utm +zone=30 +ellps=GRS80 +towgs84=0,0,...
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1answer
78 views

Re-projecting a Raster in R to matching resolution, crs, and origin, but different extent

I have raster layers in a few different projections that I've loaded into R. I eventually plan on using the "merge" function of the raster package to bring these together as one surface, but to do ...
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1answer
22 views

OpenLayers: projection of WMS and vector layers

I have two layers in my OpenLayers map, the background in WMS and GeoJSON features in a vector layer, both in ESPG:3006. (And a standard OpenStreetMap background just to see which one of the layers ...
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Point layer problem

In QGIS 3.4 I've got a map with 2 vectors and 1 spreadsheet with point data that works fine. I successfully added a second set of point data from a separate spreadsheet. I can zoom to the layer but I ...
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2answers
42 views

Calculate new coordinate based on distance traveled between two other coordinates

We have two coordinates (latitude, longitude) and let's assume we want to travel along a straight line between them. After traveling a certain distance along this line, we would like to calculate a ...
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29 views

Using North Pole Orthogonal projection in QGIS?

I was looking for the North Pole Orthogonal projection in QGIS but I haven't found it yet. Is there any way to add this projection in CRS?