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.
318
questions with no upvoted or accepted answers
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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 ...
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6
votes
1
answer
836
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 ...
- 161
6
votes
0
answers
800
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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 ...
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5
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0
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172
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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 ...
5
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0
answers
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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 ...
- 151
4
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0
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104
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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 ...
- 41
4
votes
2
answers
733
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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 ...
4
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0
answers
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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 ...
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3
votes
0
answers
203
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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 ...
- 59
3
votes
0
answers
145
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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 ...
- 131
3
votes
1
answer
255
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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 ...
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3
votes
1
answer
287
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,
...
- 251
3
votes
0
answers
691
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
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3
votes
1
answer
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Extract derived data fields from Shapefiles
I've uploaded shapefiles with professionally supplied survey data into QGIS and it all plots fine, then when I export the attributes table into Excel I see that the XYZ values are all zeros.
I know ...
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3
votes
0
answers
999
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 ...
- 79
3
votes
0
answers
2k
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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....
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3
votes
0
answers
300
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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 ...
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3
votes
1
answer
462
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 ...
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3
votes
0
answers
696
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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 ...
user22170
3
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0
answers
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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 ...
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3
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0
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181
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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 ...
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3
votes
0
answers
941
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. ...
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2
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0
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59
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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, ...
2
votes
1
answer
263
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.
...
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2
votes
0
answers
134
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(...
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2
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0
answers
237
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 ...
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2
votes
0
answers
238
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=...
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2
votes
0
answers
55
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 ...
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2
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0
answers
538
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 ...
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2
votes
0
answers
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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 = ...
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2
votes
0
answers
236
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 ...
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2
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0
answers
122
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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":"...
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2
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0
answers
320
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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 ...
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2
votes
0
answers
67
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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 ...
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2
votes
0
answers
112
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°...
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2
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0
answers
49
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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 ...
2
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0
answers
192
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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 ...
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0
answers
607
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Finding coordinates by Azimuth
I am working on a forest project. I have one central point (I know coordinates of it), than I have azimuth and distance of trees from this central point.
How can I find coordinates of trees?
p.s. ...
2
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0
answers
122
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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 ...
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2
votes
0
answers
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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 ...
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0
answers
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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:
...
2
votes
1
answer
2k
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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 ...
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2
votes
0
answers
77
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 |...
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2
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0
answers
289
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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 ...
2
votes
1
answer
113
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 ...
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2
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0
answers
569
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 ...
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2
votes
1
answer
825
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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 ...
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2
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0
answers
579
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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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2
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0
answers
593
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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 ...
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2
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0
answers
282
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
...
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