Questions tagged [coordinates]

Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.

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285 views

QGIS showing decimal degree coordinates in map/layout composer display

I am using QGIS (2.18 or 3.0) to create nautical charts drawing upon NOAA raster tiles and other info (e.g., lines showing magnetic north). I now want to save PDF files for different subareas using ...
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1answer
987 views

coordinate capture in QGIS 3.0

My understanding is that "coordinate capture" is "built into" QGIS 3.0 -- rather than being a plug-in. However, I can't find where to start it. How do I navigate to that option and what do I need to ...
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2answers
994 views

Units for LLA to ECEF conversion

I wish to implement this formula from Wikipedia to convert LLA to ECEF coordinates: where and a and b are the semi-major and semi-minor axes respectively. My question is: what units will this ...
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1answer
183 views

Create a point shapefile from table in .accdb database

I am a beginner in Python. I have a database in .accdb format of Access 2007. The database has a table called "T_point_RT" which has point data. I want to create a point shapefile from North and Est ...
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2answers
2k views

Extract center coordinate polygon

I am new to R and I am looking for a little help. I have a polygonized raster image and I want to get the middle coordinate of the image. I have tried gCentroid but there I get a list of multiple ...
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1answer
122 views

For each row of GPS coordinates, get value from nearest road to coordinates and copy to said row using PostGIS? [closed]

I have two tables in my database; one contains a set of GPS coordinates of a car which have been converted to geom, and another containing Open Street Map road data, including the speed limit for most ...
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1answer
860 views

Convert over 360 degree range of coordinates to +/-180 longitude range in R?

I'm working with data on sea surface currents from ftp://podaac-ftp.jpl.nasa.gov/allData/oscar/preview/L4/oscar_third_deg The data has the latitudes and longitudes saved in the following format: ...
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1answer
2k views

Convert xy coordinates into GPS coordinates

I have quite a large dataset with only a x and y coordinate which came from a program that is no longer usable. However I have the GPS coordinates of a few xy coordinates: | place | X | Y | ...
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2answers
305 views

Position of points in a QGIS vector layer

I have created a new layer overlaying a map, then chosen the "add feature" tool to add points, which I have named with numbers, representing the location of customers. I need to have the coordinate ...
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1answer
175 views

Modify x- y- coordinates by hand (RD)

I am new with QGIS. I know how to generate the x and y coordinates by using the field calculator ($x, $y). I know these are just static values. What I want to do is to change the coordinates by hand ...
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1answer
293 views

What are duplicate vertices?

I am trying to upload a set of polygons to an online map interface and I keep coming across the error that there are duplicate vertices. What does this mean? Below are the coordinates for all vertices ...
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1answer
48 views

Displaying USNG Coordinates in ArcMap?

I need to display points in ArcMap using a spreadsheet with United States National Grid (USNG) Coordinates. I have previously done it with Lat/Longs where I convert the spreadsheet to a table, right-...
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1answer
83 views

WGS84 Coordinates?

i'm having some trouble figuring out the following coordinates of some ground control points. Here are the contents of the .txt file: Header>> Delimiter(,) FileFormat(Name,Lat(North),Lon(East),...
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1answer
51 views

Trying to build lines by cursing through points

I am trying to create a tool that creates lines from selected point features. I am able to select the point features and create a search cursor to curse through them. I can message box attributes ...
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2answers
60 views

Points not at right location

I know the questions have been asked, but I can't make it through! So, I have uploaded a CSV with my Lat/Long coordinates (in degree decimals). Every points should be located in Quebec, but it all ...
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1answer
77 views

How to get the exact coordinates of Wolfcamp aquifer locations?

I currently working on the data set "Wolfcamp Aquifer", but the coordinates in the data set is just a relative coordinates. So, is there anyone who has the original coordinates?
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2answers
62 views

obtaining coordinates of a shapefile

I created a voronoi polygon using the coordinates shapefile of over 3,000 enumeration areas. How do I get the boundary coordinates of each of the enumeration areas for mapping purposes?
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1answer
150 views

Linking two GeoJSON data files using Python?

I am new to using GIS data in Python. I have two datasets in GeoJSON format. One of them has states of a country with multi-polygons representing each states. The other has multiple points of latitude ...
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0answers
81 views

Transform point cloud from ENU (east, north, up) to LLA (lat, long, alt)

I am having point cloud (xyz) in ENU format. I need a pipeline to convert all the points in the point cloud to geocentric LLA (lat, long, alt) coordinates. Is there any tool using which I can achieve ...
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1answer
6k views

Extracting value of raster with coordinates using R?

i'm currently working on the distribution of different species on an area, for 23 years. I'll show you a sample of my data, it will be easier to get. My dataframe, let's call it df. x y ...
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1answer
343 views

Georeferencing terrestrial LiDAR point cloud?

Recently I took a Faro Focus terrestrial laser scanner to a forested area and collected multiple scans for 12 fixed radius plots. Each plot had 5 GPS points collected within it in hopes to ...
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0answers
190 views

Formatting CSV file to export it as DXF?

I want to use this online converter to convert a csv file to a dxf file. The data I have in my database goes like this: | Point | Poligono | Name | Coords X | Coords Y | Level(Z) | |------...
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1answer
85 views

How can I apply a reverse QgsCoordinateTransform on a QgsGeometry in pyqgis?

I have defined xform as a QgsCoordinateTransform to project geographic coordinates. I can use unprojPoint = xform.transform(point, QgsCoordinateTransform.ReverseTransform) to do the reverse operation, ...
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3answers
244 views

Dynamically update points with xy coordinates in table

I have an Oracle database table with columns for 'X' and 'Y' coordinates. Now I want to display these points in ArcMap. I can use the 'Display XY data' tool for that. My table in the database with XY ...
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0answers
154 views

How to get points within boundaries which overlaps the anti meridian

Within my application I have a map and I'm showing markers on the map which represent objects that I get from the database. The objects have latitude and longitude. The objects are selected only if ...
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1answer
277 views

QGIS CRS does not have correct coordinates [duplicate]

I'm using QGIS to extract centroid coordinates in a multi-shape object from a project I was given. I want the coordinates to be regular latitude an longitude, but they're coming out huge (see below). ...
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1answer
56 views

How is geometry loaded into QGIS Midvatten plugin obs_lines table?

I have created a csv file that contains the coordinates for a series of polyline vectors and I am trying to load it into Midvatten's obs_line table. I have made several attempts at this but the data ...
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1answer
840 views

How to view coordinates instead of geometry object in geometry column in Oracle SQL Developer?

I've once found a setting in Oracle SQL Developer, allowing to display the geometry column as coordinates, instead of the generic geometry object name (e.g. MDSYS.SDO_GEOMETRY). I cannot find it ...
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1answer
121 views

Obtaining attribute data at given GPS coordinates?

I have a csv file containing information at given lat and lon GPS coordinates, as well as a shapefile containing, among other things, annual average daily traffic (AADT) values along stretches of road ...
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1answer
2k views

Compute distance between two point from longitude, latitude & height

I am currently trying to compute the real distance between two 3D points (on a WS84 ellipsoid represensation of our earth), but my knowledge in Geographic Information System is pretty nil (except the ...
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1answer
527 views

Converting projected coordinates from bbox into long/lat using R?

I have a DEM file in QGIS and would like to import the the satellite image for the same region into R. According to QGIS, the CRS used in the DEM file is: Layer Spatial Reference System +proj=...
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0answers
160 views

Openlayers coordinate grid with text lables [closed]

Need to display the coordinates in the middle of the cell of grid. I do this grid, but can not to display coordinates. At zoom this coordinates must change and display on the grid (example write on ...
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1answer
82 views

SatScan can’t read coordinate file

I just started using SatScan, but I've been getting this error “Reading the coordinates file” repeatedly and can’t run the program. I don’t know what could be the problem. Someone please help.
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1k views

Local Cartesian (NED) to Geodetic (Lat,Lon,Alt) Conversion - Max Distance from Reference Point

Looking at this: https://www.mathworks.com/help/map/ref/ned2geodetic.html: [lat,lon,h] = ned2geodetic(xNorth,yEast,zDown,lat0,lon0,h0,spheroid)) The obvious question is by how much the current ...
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1answer
450 views

QGIS Z Coordinate extraction

I want to extract the Z coordinates from the line nodes. The data is there in vector editor.
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1answer
72 views

Creating separate list of x and y coordinates from array after using getPart?

I have an array of points by using getPart on each of the four polygons in the shapefile. I am trying to figure out a way to create a list of x and y coordinates in my for loop and name them xCoords ...
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1answer
141 views

Why is query layer rounding down coordinates to 6 digits?

We have a SQL table view with point locations and are creating a query layer from it. However, the resulting points do not plot to the same location as the latitudes & longitudes in the table. In ...
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1answer
115 views

Calculating geometry in longitude and latitude using ArcGIS Desktop? [closed]

In ArcMap, I have some point features and I extract the coordinates in the attribute table For Person 1 , I extract them in unit "metres" For Persn 2, I extract them in unit "Decimal degree" For the ...
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1answer
110 views

Using Tissot's Indicatrix Validate Conversion to ECEF

When using NED & ECEF as CRS: https://www.mathworks.com/help/map/ref/ned2ecef.html?requestedDomain=true Am I should worry from getting 'classical' projection issues? For example when x,y are ...
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2answers
127 views

Choosing CRS for metric distance calculations? [closed]

I have the following ArcPy script to calculate total length of Polylines in a Feature Class/Shapefile: arcpy.Project_management('lines.shp', 'lines_projected.shp', arcpy.SpatialReference(TODO EPSG ...
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1answer
38 views

How to adjust coordinates of duplicated layers on QGIS

I am having an issue with QGIS. There are two layers (opaque green and brighter green) which are in different positions but are showing the same coordinates (tables below). How do I update layer ...
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1answer
75 views

QGIS attributetable: show $x and $y in other CRS than layer

I have a point file with an attribute table. In the attribute table I am able to display the X and Y coordinates using the field calculator. These coordinates are in ETRS89. Because the end-user of ...
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2answers
255 views

QGIS and Google map doesn't match/lineup!

I am trying to draw a map but in QGIS the map doesn't correctly show one of my study area (Station-4) correctly; however, the Google Map does. What should I do now to get a correct map (Station-4) ...
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2answers
334 views

Downloading data layer from website map based on google maps?

This website https://www.oplaadpalen.nl has a map with markers of charging stations. Is there a way to get the coordinates of each marker from the source code?
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1answer
1k views

when given bearing, angle, and distance, how to find change in location in 3d

I am helping a drilling team find the surface location representing a point in the ground. I am given the following values: surface location latitude and longitude Drilling depth (length of drill ...
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3answers
194 views

Extract exact coordinates of points?

I am using ArcGIS and have a shapefile with data points. They have UTM x and y coordinates, so I can plot them in ArcGIS with "Display XY data". Now I saw that many points are not exactly on the road, ...
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1answer
191 views

Determining TMS format from url

When I see some MapServer I usually get deeper and checking how it was done. Recently I found on one server where is avalanche map strange tms url. I haven't seen it before but probably some of you ...
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1answer
3k views

Package sp : coordinates function error no numeric matrix

I am trying to use coordinates function from sp package to transform my data in spatial data. I made sure I deleted all the NAs values and that all my data is numeric, however, i still get the same ...
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1answer
1k views

Convert meters to decimal

I have the following coordinates in meters for UTM 34S / Datum WGS-84: Lat.: 311965; Long.: 8695153; How do I convert these coordinates into decimal degrees or DMS?
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0answers
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Add xy Data from csv adds data but changes xy values?

I have an issue with adding xy data from csv. files. Data in csv properly formatted (name, x-point,y-point,z-point). After importing them, when I click on Identify it shows location x and y ...