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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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proj4js with geocentric CRS

I am developing a little web app to transform coordinates between CRSs. To do that I am using proj4js, but I notice that proj4js can't work with geocentric CRSs. Is there another tool similar to ...
Jawensi's user avatar
  • 135
6 votes
1 answer
998 views

Math formula to calculate GPS location for weighted GPS data points

I'm working to improve the location and accuracy of a map / data-point driven application. I have a collection of locations of interest. Each location of interest has a collection of data points that ...
Dan's user avatar
  • 161
6 votes
0 answers
895 views

Cartesian co-ordinate system with set 0,0 point?

This is for visualization in construction project planning: I would like to set a 0,0 point and angle relative to North for an X,Y (and possibly Z) Cartesian co-ordinate system that will then show ...
erkq's user avatar
  • 91
5 votes
0 answers
189 views

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 ...
Mailon Figueiredo's user avatar
5 votes
0 answers
1k views

How to get pixel coordinates in QGIS georeferenced output map?

using the QGIS Georeferencer GDAL plugin, I can select GCPs (ground control points) on a map (plain raster input map image in a format like PNG or TIF) in an unknown projection and boundaries, and ...
jmarina's user avatar
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4 votes
0 answers
144 views

Map projection which is most accurate in the (global) calculation of "Poles of Inaccessibility"

I would like to calculate the "Pole of Inaccessibility" in QGIS for several polygons. The polygons (administrative boundaries of countries) are globally distributed. When calculating in ...
rseo's user avatar
  • 41
4 votes
2 answers
1k views

Decode Google Polylines in JS

I am a complete novice at coding and am trying to return a decoded polyline in array of (lat;lng) from an encoded polyline string. I found a similar post here Converting encoded polylines into GeoJSON ...
Raymond Woodley's user avatar
4 votes
0 answers
1k views

Schematic Map in GIS Tools?

The Question: Is there way to leverage GIS tools to author/edit a schematic map where elements' geometries has canvas-based coordinates rather than real-world coordinates on Earth? Perhaps to ...
Omar Ajlouny's user avatar
3 votes
0 answers
243 views

Travelling salesman but doesn’t have to be most efficient route just trace the roads. (Python and QGIS)

I’ve got a project; for one part of this project I intend to draw a route over a shapefile, it contains 9000 nodes. What I’ve tried: Generating routes on a map layer in QGIS by following the lines of ...
IceBear123's user avatar
3 votes
0 answers
166 views

How to properly convert from WKT to euclidean 3d points?

I am not a geoscientist (I do computer graphics), however I am trying to render some geospatial data encoded as a WKT file. I have a POLYGON with 2 coordinates per point, which seems to be ...
Makogan's user avatar
  • 131
3 votes
1 answer
287 views

GeoJSON file content not display properly in Leaflet

I am new to Leaflet. Am facing one issue when try to display GeoJSON file in Leaflet. Issue: Actually some GeoJSON file only am facing this problem. In my knowledge coordinates are in different ...
Ram prasad's user avatar
3 votes
1 answer
322 views

Getting the first point's coordinates of column with type path

I have the table above CREATE TABLE public.geometry ( id serial not null primary key, distance float not null, height float not null, coordinates path not null, ...
chatzich's user avatar
  • 251
3 votes
0 answers
802 views

Changing order in Coordinate field in QGIS

Can I change the order of how my coordinates will display on QGIS? I would like to display Latitude, longitude instead of longitude, Latitude
Simon GIS's user avatar
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3 votes
0 answers
1k views

COLLADA files and geographic coordinates

I am failing to understand something here, from the arcgis help page: "The Multipatch To COLLADA tool can be used to export multipatches to COLLADA files on disk. COLLADA is a 3D model format ...
Posad's user avatar
  • 79
3 votes
0 answers
2k views

Modify features not updating on vector layer

I have point vector layer in my application.Now I am trying to modify its coordinates. I am able to do it but its not reflecting on layer. Here is code I am using : var selectInt = new ol.interaction....
Veena Hosur's user avatar
3 votes
0 answers
300 views

QGIS 2.8 PrintComposer, no coordinates shown

I tested under MacOS 10.10.3 and 10.9.5 now: In the QGIS v2.8 Print Composer I don´t get coordinates shown when I want to create a map sheet and activate "Draw coordinates". I can do all settings ...
naugustin's user avatar
3 votes
1 answer
479 views

Finding point within box using MongoDB?

Suppose the point has coordinates for a search within the box: (long:-155, lat:19) If we have the box: SW - (-170, 10), NE (29,69) that everything is fine and we can find this point because it's ...
Kath's user avatar
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3 votes
0 answers
701 views

How to locate a house on the 3D Map correctly?

I've done my 3D map generation in WebGL/THREE.JS project and have an issue with the building locations. I have the data about building position ( its polygon ) from DB server, but first of all I want ...
user avatar
3 votes
0 answers
1k views

Should 2D Positions and 3D Positions be considered conceptually different entities?

Let's suppose we want to model GeographicPositions, described by coordinates or coordinate tuples inside some Coordinate Reference System. Also, these would be put inside some sequence to represent ...
heltonbiker's user avatar
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3 votes
0 answers
184 views

Unknown gridlines on old Greenland base map!

Can anyone help me out please? I'm using an old 1:10,000 base map of Greenland for a mapping project with nice 10cm gridlines already drawn on. However it uses a coordinate system which is unfamiliar ...
Eleni Wood's user avatar
3 votes
0 answers
952 views

How to Batch Change X, Y Coordinate Number in ArcGIS?

I have a huge number of points (100000 points). Some of these have the same x,y coordinates. For example, 50 points are same in x,y then 100 points are same in another x,y coordinates and so on. ...
BBG_GIS's user avatar
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2 votes
0 answers
80 views

Transform coordinates from ITRF2014 (2020.39) to ITRF2008 (2010.0) using PROJ4?

Due to the fact that I cannot convert the coordinates obtained at epoch 2023.39, X = 1710698.054 meters; Y = 3046082.270 meters; Z = 5318707.282 meters, I still cannot understand how to use in this ...
El_Faie's user avatar
  • 21
2 votes
0 answers
88 views

Creating isochrones with given coordinates and times in QGIS

I have an origin coordinate and a list of destinations. Each list element has the related coordinate and the minutes spent to reach it. I want to build an Isochrone map starting from this data, ...
Claudio Tomasi's user avatar
2 votes
0 answers
196 views

How do I display coordinates of each polygon corner in the attributes table

Is there a way to display coordinates of each corner of a polygon in the attributes table? My end goal is to create a map that shows point numbers and coordinates for each corner of a polygon.
Sylvino's user avatar
  • 105
2 votes
1 answer
475 views

Why does the right side coordinate does not appear?

I was working on QGIS 3.28 and the CRS is WGS 1984 Web Mercator. Apparently my right side coordinate doesn't appear in scale 1:750.000. But it appears when I change the scale to 1:2.000.000 or above. ...
romeoalpha00's user avatar
2 votes
0 answers
146 views

Get the image coordinate from GeoTIFF

I am new to GIS, I publish one TIFF in GeoServer like this I can use Java to get (x1,y1)(x1,y2)(x2,y2)(x2,y1) GeoServerRESTManager manager = null; try { manager = new GeoServerRESTManager(...
AiMM's user avatar
  • 21
2 votes
0 answers
283 views

How to extract clusters perimeter’s geographic coordinates?

I have a 4000 lines dataframe composed of 2 columns : latitude and longitude. I realized a DBSCAN clustering (python code) based on harvesine distance to group points within a radius of 2km (code ...
JEG's user avatar
  • 41
2 votes
0 answers
333 views

Extent of a proj4 string

I have a custom proj4 string in which my data is represented in Cartesian local coordinates. The example proj4 is below. +proj=tmerc +lat_0=44.155877943 +lon_0=141.655514872997 +k_0=1.000004976 +a=...
arun thatham's user avatar
2 votes
0 answers
58 views

Transforming multiple sets of coordinates in attribute table by name of field using PyQGIS

I have a script that takes a set of points and computes the distance to nearby geographic points taken from OSM data. The output layer is the point layer with new fields showing the distance to, name ...
Axekan's user avatar
  • 251
2 votes
0 answers
591 views

Calculating coordinates of two GPS points whose line through them is perpendicular to two other GPS points

Given two GPS points A and B, I would like to compute the GPS coordinates A1 and A2. [A1A2] forms a segment perpendicular to segment [AB]. For this, I start to compute M1, which is the midpoint ...
Kyv's user avatar
  • 121
2 votes
0 answers
2k views

Is there a way to set CRS in st_sfc

Did something recently change with the sf library? My code, which has been working for a long time, no longer works. Here is what I am doing... pt1 = st_point(c(lowerLeftLong, lowerLeftLat)) pt2 = ...
jonesy19's user avatar
  • 107
2 votes
0 answers
308 views

Listing lat/long coordinates of every point inside polygon or shapefile using QGIS

This is likely a beginner question but I've seen numerous posts on how to export the boundaries of a polygon as coordinates, but none on exporting the area of a polygon as coordinates. I am ultimately ...
Laura's user avatar
  • 21
2 votes
0 answers
141 views

Iterate through list with numbers (as text)

I want to iterate through a list of coordinates and see it the last coordinate matches the first coordinate. The coordinates are stored in have a GeoJSON string: '''{"type":"...
GIStrees's user avatar
  • 119
2 votes
0 answers
348 views

Meridian Convergence in UTM and Gauss Kruger Projection system?

There are points where geographic coordinates (latitude and longitude) are known. I have calculated the UTM (Universal Transverse Mercator) projection coordinates of these points and then I want to ...
Sun's user avatar
  • 113
2 votes
0 answers
74 views

QGIS: Placing points on a shapefile in relation to their distance to other points on that shapefile

I'm attempting to add UK railway signal-boxes to QGIS to extract their coordinates - there's over 1000 of them. I have: The entire UK railway network shapefile The coordinates of train stations on ...
zaza_space's user avatar
2 votes
0 answers
116 views

Subdividing a GeoTIFF into 1x1 tiles of longitude and latitude?

I have a big GeoTIFF file of the whole Slovakia territory in 25m resolution. It has around 17700 x 8000 pixels. I need to subdivide it into smaller files and every file must have 1° longitude and 1°...
Jurij's user avatar
  • 21
2 votes
0 answers
50 views

How to calculate coordinate of a selected points in QGIS?

How to calculate coordinate of a selected points in QGIS? Not just x, y, I need like this: X = 77° 1' 5.032" E Y = 28° 38' 58.034" N. Refer the attached image the (x,y,z) columns coordinate ...
Dharma Ranjan Sahu's user avatar
2 votes
0 answers
218 views

Problem with the correct calculate of the bisector of the angle

I have a problem with the correct calculate of the bisector of the angle. I use WGS84 projection. I have a bisector's bearing (azimuth), coordinates of start point and line length as input. Some ...
daamiansz's user avatar
2 votes
0 answers
130 views

Problem with intersects operator in Postgres

I have this table below CREATE TABLE public.geometry_polyline_volume ( id serial not null primary key, distance float not null, height float not null, coordinates ...
chatzich's user avatar
  • 251
2 votes
0 answers
2k views

R sf polygons not (all) closed

Sometimes when trying to construct an sf object from an sfc object I get the following error: “Error in MtrxSet(x, dim, type = "POLYGON", needClosed = TRUE) :polygons not (all) closed”. I am sure ...
kalakaru's user avatar
  • 562
2 votes
0 answers
73 views

In a software application displaying latitude & longitude, should N/S/E/W be localised?

In English software, it's conventional to render WGS 84 co-ordinates in a manner similar to the following: 38.8951° N, 77.0364° W or, encoding the directionality into the numeric values: ...
Lightness Races in Orbit's user avatar
2 votes
1 answer
3k views

Generate coordinates with Minimum/Maximum distance from given coordinates

Background: I am trying to create a coordinates generator for Unit Testing my code. I would like to try to test cases for methods like: // Check if within 10km. // Should pass because it is 0 - 10km ...
captainskippah's user avatar
2 votes
0 answers
80 views

Getting minimum distance of points with scalable algorithm

I have a number of geographical coordinates with latitudes/longitudes: id | name | lat | lon 1 | New York | 40.730610 | 74.0060 2 | Philadelphia | 75.1652 | 39.9526 3 |...
ulima2_'s user avatar
  • 129
2 votes
0 answers
318 views

How to find coordinates of a triangle with azimuth?

I am just starting out in GIS and it's been a long time since I took math in university. I am teaching myself through a textbook but there are a few questions I am stumped on. Essentially I have a ...
Lianne Friessen's user avatar
2 votes
1 answer
117 views

Map eastings in QGIS 2:18 Print Composer alternate between correct values, then negative values

Using CRS OSGB 1936 (ESPG 4277) at various map scales in Composer, I find that the northings are all correct, but the eastings alternate between two or three correct values, then two negative ones. I ...
Colin Coates's user avatar
2 votes
0 answers
576 views

Moving a feature to a new XY coordinate

I know how to move a point feature to a new location based on an updated XY coordinate. For example, joining an Excel or dbf table with the new XY cords to the production feature class attribute table ...
Alan Gomez's user avatar
2 votes
1 answer
939 views

Calculating relative position between geocoordinates and distances

I am working on a Unity application and am using the Haversine formula to calculate the distance between two points. I know the overall distance + the distance along the latitude and longitude are ...
mquickel's user avatar
  • 121
2 votes
0 answers
619 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 ...
Andrey Shipilov's user avatar
2 votes
0 answers
629 views

Using OSTN15 to convert British National Grid data to KML

I'm trying to save 2D data on a layer (currently to British National Grid co-ordinates) to an accurate KML version using QGIS 2.14.19 Essen. Saving directly to KML using the WGS84 CRS doesn't give an ...
K Jones's user avatar
  • 21
2 votes
0 answers
291 views

Fill QLineEdit with coordinates by click on QGIS canvas

With a plugin I can click a button and activate a QgsMapTool, defined as: class PointTool(QgsMapTool): def __init__(self, canvas): QgsMapTool.__init__(self, canvas) self.canvas = canvas ...
Stefan's user avatar
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