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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0
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1answer
42 views

Arcgis FeatureLayer.MODE_ONDEMAND not select exactly coodinate?

I'm working with ArcGis API. I push my Feature Layer on map in MODE_ONDEMAND. But when I select feature (selectTask), the coordinates come out as [692010, 101011], with no decimal places. What I want ...
1
vote
1answer
186 views

Finding coordinates of the image corner

I have a .bmp image with a map. For creating image i used a Ingeo 4.4 and function MakeImage() What i know: Height an Width of bmp image dpi Map Scale Image Center's coordinates in meters. What i ...
1
vote
2answers
62 views

How to create polygons associated to coordinates (QGIS)

I'm trying to create polygons associate to given .csv files. On the polygon I would have to be able to read the coordinates x, y (AND Z) because I need to interpolate points and work with them. I know ...
0
votes
0answers
42 views

Problem adding google map coordinates to arcmap

I am having some issues adding x y coordinates from Google Maps into ArcMap. I am adding the following table to ArcMap by specifying X-Field as longitude, and the Y-Field as latitude:. However, when ...
4
votes
1answer
100 views

Importing LiDAR .txt in QGIS for map conversion

I have LiDAR data in .txt files (1000 to 26000 KB), where 2nd column marks x-coordinates, 3rd col y and 4th col z. 8 485000.16 6508997.48 1.84 66 Last 2 485001.27 6508998.92 1.86 82 Last 2 485001.02 ...
2
votes
2answers
4k views

From coordinates find country using Python

I have tweets with coordinates. I'm trying to bucket the tweets by country using the coordinate information. I know that I can achieve this using some hosted web services but all of these have API ...
1
vote
1answer
115 views

Shifting LiDAR point clouds that have been incorrectly georeferenced

I am new to LiDAR and have never been a part of the LiDAR data pre-processing stage and hence, this question. I have two LiDAR point clouds (.las files) of a densely forested area that were captured ...
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3answers
7k views

Convert geometry to latitude-longitude using PostGIS ST_Transform

My table has a geometric field, in EPSG:3857, of type point. I need the latitude and longitude, in EPSG: 4326, of each point. Could someone give me a valid example of how to use ST_Transform().
1
vote
1answer
128 views

Using twitter coordinates in OSGeo library

I have twitter data with coordinates such as: [-7.2377761, 112.73091137] I'm working with a python geo library called osgeo. The sample code indicates creating a point like this. point = osgeo.ogr....
1
vote
1answer
57 views

KD-Tree implementation with lat/lon coordinates

I have implemented a KD-Tree that stores coordinates (latitude, longitude). I have also implemented a Nearest Neighbor search algorithm using the Haversine distance. Will I get correct results (same ...
1
vote
0answers
18 views

Grid doesn't show up in printer composer

I am trying to get a coordinate grid on my map with the printer composer. I have tried every example and followed it exactly but for some reason the grid doesn't show up at all. I am working with Qgis ...
0
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0answers
45 views

Project (lat,lng) GPS point to a line segment (road segment)

Is there a way to project a point A to a B,C line segment and find a point D ? The points are latitude, longitude points, so I believe we should incorporate the haversine distance formula. Edit: I am ...
15
votes
1answer
731 views

What format is a location represented like this?

While converting an old system, I came across a position column with values in a format like this: 38RQT6410550656 While I've never seen global positioning represented this way, putting this in ...
1
vote
1answer
148 views

Postgis How to populate column with geography data from geometric data?

I stored my point date in geometry format with SRID 4326 supposed EWKB (data looks like this "0101000020E610000071F1A611E9392640AECD10D8E68C4A40") = way geometry(Point,4326) I want to have the ...
1
vote
1answer
38 views

Postgres/postgis st_makepoint

I am looping through a csv, taking latlng values and trying to add there geometry to postgis enabled postgres table. xy values are int's conn = psycopg2.connect("connected") cur = conn.cursor() cur....
1
vote
1answer
55 views

Adding XY coordinate to map in ArcGIS (not in dataset)?

Is there a quick and easy way to add an XY coordinate in ArcGIS outside of creating a table? A coworker just wants to see what that point is on a topo background. I just want to see where a ...
0
votes
1answer
87 views

Inverted lat lon on drawn polygons in Openlayers 3

I am working on a map in openlayers 3 with geoserver I display the layers as WFS and I added the draw and modify interactions, but when I save the drawn polygons the coordinates of the newly drawn ...
2
votes
2answers
50 views

Which points in projected raster corresponds to certain latitude,longitude location?

What I have is a SRTM 3 arc-second raster file in WGS84 geographic coordinate system (here is that file). I then project it to the Azimuthal Equidistant projection with GDAL: gdalwarp -s_srs EPSG:...
1
vote
1answer
61 views

Fill array with coordinates within geographical bounds in Leaflet

I want to create an array and fill it with geographical coordinates I get from a bounds variable. Basically, a for-loop shall create coordinate pairs within the specified bounds with a fixed distance ...
2
votes
1answer
38 views

Wrong calculation of line start and end XY coordinates of a merged line- how can I fix this?

I have a feature class containing several rivers, which are derived from merging individual river segments to make a continuous line. They have been merged using the editor tool. I have calculated ...
5
votes
1answer
993 views

Geotagged tweets and Twitter API

When I do a timeline query using the Twitter API, http://api.twitter.com/1/statuses/user_timeline.xml?screen_name=MyTwitterName the geographic component of the reply looks like this: <geo>&...
0
votes
0answers
45 views

Converting polylines coordinates stored in PostGIS in column type text, in another column type geometry(MultiLineString,2154)?

I want to draw a polyline on a leaflet map and then send it to PostGis with php. I’m drawing my polylines using the Leaflet draw plugin and send the coordinates in a column “coords” in PostGIS with ...
1
vote
2answers
39 views

XY Coordinates result in weird scale

Currently trying to display XY data with what I consider unusual coordinates. These coordinates come from a transit scheduling software called HASTUS. Though I'm able to plot the points in relation to ...
3
votes
1answer
88 views

Coordinate points not lining up with a preexisting map on QGIS

I asked this question once before, but I did not receive any feedback on solving on the issue and I am still confused as to what I am doing wrong. I found a public domain map of Florida counties on ...
8
votes
3answers
4k views

What are the coordinates of the mysterious hole in Siberia?

I am interested in taking a Google Earth aerial view of the mysterious hole recently discovered in Siberia and perhaps doing some hydrological analysis of the area in a GIS. However, there appears to ...
3
votes
1answer
110 views

Change the actual coordinates in a shapefile (QGIS)

I'm trying to map data for a county in Texas. The data were provided to me in a shapefile, and I've been working with it in QGIS 2.14. My problem is this: The coordinates in the shapefile I was given ...
3
votes
2answers
155 views

Transform geometry to coordinates

I need transform with postgis a geometry of type ...
2
votes
1answer
39 views

How do Wikipedia maps add a coordinate point to a base map?

On wikipedia pages for localities, there is often a map on the right side of the page in the introduction, and the map is tagged with the point of the locality. For example, see below: https://en....
5
votes
3answers
117 views

Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?

I want to convert a square polygon that is close to the edge of UTM zones 15N and 16N. The polygon's coordinates are in UTM 16N, but it is spatially positioned in the UTM15 area. My question is that ...
2
votes
1answer
57 views

Coordinates calculation using QGIS

I am quite new to GIS software. I use QGIS. I have a question that might be trivial. I would like to derive the coordinates (Y and X) for an area. Just to make an example: I have two regions A and B. ...
0
votes
0answers
33 views

Selecting the feature under the pixel

I am using a Vector/kml layer with an event to show a popup when the user clicks on an item. Relying on the evt.pixel doesn't look fine, since rarely does the user click exactly on the middle of the ...
0
votes
0answers
26 views

How do you line up a pre-existing public domain map with csv coordinate points on QGIS?

I have been struggling with this simple problem all day. I found a Florida map with the counties on Google for GIS. I uploaded the map to QGIS with no problem. However, whenever I try to upload points ...
1
vote
1answer
49 views

retrieve rectangle from a latitude and longitude coordinates in FME

I wanted to retrieve a rectangle with FME from two points (point 1: latitude and longitude and point 2: latitude and longitude) that are stored in the postgres database in text fields: text field 1 = ...
2
votes
3answers
68 views

Identifying coordinate system?

I'm wanting to create a data layer using some open crime data from Salt Lake City, but I can't figure out the coordinate system they are using. See the link below to view the data. (You'll have to ...
1
vote
1answer
36 views

How to determine the closest feature to my points?

I am doing a research on transportation for motorcycles. For each trips, I have the origin points and the final destination coordinate points. I also have another landuse layer with my points of ...
27
votes
7answers
46k views

How do I create point features with exact coordinates?

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: -Add point, type ...
0
votes
1answer
137 views

How can i convert the coordinates (latitude,longitude) to X,Y using postgis

I want know how i can convert the latitude and the longitude coordinates of a rectangle in the Cartesian coordinates, so I can store them in a geometry field using postgis.
3
votes
0answers
95 views

GPS points displaying in the wrong place [closed]

I'm trying to help a student by importing an excel table of Lats and Longs into Arcmap, but they are displaying in the wrong location - I am also a bit suspicious of the coordinates. I imported the ...
1
vote
4answers
3k views

clipping polygons (vector) map with a polygon (vector) layer

A frustrated newbie with QGIS Lisboa version in Windows 7. I want to clip a soil map (multiple polygon vectors) with a single polygon (rectangular polygon vector). The project projection is set at ...
1
vote
0answers
9 views

Georeferencing image from google maps with gdal_translate? [duplicate]

I am trying to georeference an image using gdal_translate in a command prompt. Currently I have the following gdal_translate.exe -of GTiff -a_nodata 0 --config GDAL_DATA "Config location" -a_ullr -77....
0
votes
0answers
40 views

Forming a uniform grid of GPS coordinates from a starting GPS coordinate

I'm trying to find a method in which I can form a uniform 2D grid, relative to a starting GPS coordinate. See the diagram below The red point represents the starting GPS Coordinate, which can be ...
0
votes
1answer
2k views

How to adjust the difference between the coordinate from OpenStreetMap and Google Maps

I have downloaded the OSM from OpenStreeMap that came with all nodes from the map and their respective coordinates. Now I have to plot a node (latitude and longitude) on Google Maps, but all ...
0
votes
1answer
39 views

Find Lat and Long points on land only

I'm new to R and GIS so please forgive me if this is a simple request. I was looking for a way to find out if a Lat/Long point is on land or ocean. I found this previous post from a couple of years ...
2
votes
3answers
2k views

how to extract a rectangle corner coordinates in python script

i want to extract a rectangle corner coordinates of a shape file in python script..please suggest me a solution. Thanks in advance, Bhavya
2
votes
1answer
121 views

Identify coordinate system used near Kuala Lampur

I have some coordinates that were given to me, and I do not know much about how they were taken. I thought they were UTM coordinates, but when I try to convert them using some online tools I always ...
0
votes
2answers
45 views

Extracting polygon coordinates from only two specific corners

End goal: To add two (or 4) fields to a polygon grid feature class which will contain coordinates of the lower left (southwest) and upper right (northeast) corners of each grid. I have a feature ...
0
votes
2answers
76 views

Generating random points near a location [closed]

In the following solution, why is there a sqrt(u)? Since u is just a random number in [0, 1) doesn't getting the sqrt just give you another smaller random number? To generate points uniformly, ...
1
vote
1answer
39 views

Point coordinate shift after python toolbox processing

I am working on custom clustering in ArcMap. For it I have created a python toolbox, where I do the processing. However, as a result I get slightly shifted points (6-20 meters), while they shall stay ...
1
vote
0answers
19 views

Create pointe layer with table [duplicate]

I have a table with 13,000 points of geographic coordinates ( degrees, minutes , seconds) How I can create a layer of points ? QGIS or Arcgis . it is possible to create a layer of points with ...
1
vote
1answer
72 views

How can I get the outline coordinates of bodies of water in a country? (Lakes, River, ponds) From Google Maps or any other data set [closed]

I'm in need of acquiring the coordinates of the outlines of all the water bodies inside a country, with the exception of "Sea" or "Ocean" water. Right now, I'm manually outlining the lakes and rivers ...