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.

learn more… | top users | synonyms (3)

1
vote
0answers
13 views

QGIS: Points in Polyon with two different CRS [duplicate]

I'm relatively new to QGIS. I've got a layer that shows the boundaries of the wards in the UK. In addition to this, I've got a csv file, which has long/lat plus an answer (binary). The problem is, ...
1
vote
1answer
14 views

Projected Coordinate System for South Australia

I am calculating areas of polygons and distances between points in a small park in South Australia (~ 139.4 longitude, -34.3 latitude). All of these points are currently in GCS WGS 1984, and the ...
1
vote
2answers
87 views

Why do my points end up in Africa? (should be Croatia)

I have the correct coordinates in a excel file, but when I import the file, the point always goes to the wrong place. (I need it in Croatia, and it puts the point in Africa) I've tried chaging CRS ...
1
vote
0answers
13 views

Export/print QGis: dismatching OSM data on an OSM-layer

On QGIS (2.10, winXP). is there any known problem by exporting or printing .osm-data (from JOSM) onto an Openstreetmap-Mapnik-layer? The imported waypoints always shift from the left less and less ...
4
votes
3answers
18 views

gdalwarp to geographic coordinate system

I'm getting the folllowing Error when trying to re-project a raster from NAD_1983_Albers to GCS_North_American_1983. I used the proj4 defenition from going to Properties in QGIS of the layer whose ...
1
vote
0answers
24 views

How to perform statistical test for two sets of points?

(I have asked this question originally on Cross Validated; however, no good answer and someone suggested me to ask the question here). We know that we can perform statistical test (e.g., t-test) for ...
1
vote
3answers
135 views

What is the Origin of WGS84 UTM 18N?

I was given an unprojected coordinate in the form of lat, lon and I am using pyproj to convert to projected coordinate as such: from pyproj import Proj # New Jersey lat = 40.704895 lon = -74.094994 ...
1
vote
0answers
21 views

Updating mapnik stylesheet to render WGS84?

We have a production tile server loaded using osm2pgsql serving osm-bright, osm-carto and osm-mapquest style tiles and would like to be able to server those in WGS84 projection, as well. I've tried ...
3
votes
2answers
43 views

PostGIS raster - [x,y] from lat/lon

I have coordinates in [lat, lon]. How can I convert them to the rasters "pixel" position [x, y]? I know raster top-left corner, scale and skew.
-1
votes
0answers
73 views

Why do we say Earth rotates from west to east? [closed]

It is said that Earth rotates from west to east. I take this as Earth's western hemisphere moves towards the Eastern hemisphere when seen from the frame of reference of pole star. Now I can ...
2
votes
1answer
51 views

How to display different layers with different CRS in one canvas in a standalone application?

I am a freshman of the pyqgis. Now I load the raster and vector data in the standalone application. The two data are same area, but in my canvas, they are at different places. I want to know how to ...
-1
votes
2answers
30 views

Projection for using ArcGIS as CAD [closed]

I want to use ArcGIS to map my apartment. How can I create a projection file (with which parameters)?
1
vote
0answers
27 views

In OpenLayers 3, transformExtent to EPSG:8155 produces error

I'm trying to get the extent of a map using OpenLayers 3, so that I can use it in a CQL filter to limit the area of the WMS request to the area currently shown in the map extent. To do this, I have to ...
2
votes
0answers
35 views

Find gravity normal by ECEF or GPS coordinate of point

How to find gravity normal by ECEF or GPS coordinate of point? Is it the same as normal to elipsoid? Is this ordinary way to calculate normal to ellipse? I'm not quite sure which altitude is ...
4
votes
1answer
63 views

convert lat/lng to pixel and vice versa

This had been asked previously on Stack Overflow. I've tried different methods/formulas but results are not correct. 40.764296,-73.97302 should result into 930,3590 pixel on map image. I've Manhattan ...
1
vote
0answers
28 views

Choosing CRS to use for South Africa that will give map scale in meters in QGIS?

This has been a constant source of frustration for me. I can't seem to always get my map scale in meters in QGIS, even if I use a CRS that has map units of meters, e.g. Alberts Equal Area and others. ...
5
votes
1answer
49 views

Shapefile projections not matching up in QGIS?

To start off with, I'm very new to QGIS. I'm attempting to place a shapefile with locations for 3 substations on a map of Peniche, Portugal. The locations for the substations are given in latitude and ...
3
votes
2answers
44 views

How to re-project a shapefile to be compatible with another shapefile or raster?

I have a polygon shapefile and a raster. The shapefile and raster have different coordinate systems. Coordinate System for the shapefile: NAD_1983_UTM_Zone_19N WKID: 26919 Authority: EPSG ...
-1
votes
1answer
34 views

How to check based on GPS coordinates if point is near a given path? [closed]

Path is just a straight line defined by coordinates of the beginning and end of it. My coordinates are simply longitude and latitude of three points: start of the path end of the path my point (for ...
6
votes
2answers
114 views

Is a Helmert transform necessary to convert between WGS84 and NAD83?

I've read things all over the internet which claim that NAD83 and WGS84 are effectively equivalent (with minor ellipsoid differences). However, if I do geodetic (WGS84) -> ECEF -> geodetic (NAD83) ...
1
vote
0answers
31 views

Get distances between boundaries from an SpatialPolygon and raster pixels

I am trying to calculate the distance from several pixels of a raster to a boundary of some polygons in R as it is showed in the image. I have two problems: How to correctly define a boundary from ...
2
votes
2answers
54 views

How to get an area Latlong geometry directly from google map?

I am new to field of GIS. I need to know that do we have an option of getting latlong of a building that we see in google earth or any Point of Interest areas. Something like i create & drag ...
1
vote
1answer
43 views

Reprojection issue from WGS84 to UTM32

In QGIS I want to transform a point shapefile from WGS84 to UTM32 (EPSG:4647). The result moves the point from somewhere in Norway to a position off the coast of Congo, Africa. Can anyone explain ...
2
votes
0answers
21 views

Does ETRS89 and UTM use the same zone (longitude and latitude)?

I'm building an app for the european country Denmark exclusively and I need to retrieve some geospatial data from a (geo)server. I'm currently trying to determine wether UTM and ETRS89 uses the same ...
1
vote
1answer
57 views

Choosing projection to make Arizona look “normal”?

I am having issues projecting my AZ state boundary from looking like this: to looking like this: I found that I could use the U.S. National Atlas Equal Area to get the shape I want, but when I ...
1
vote
1answer
34 views

Repositioning DXF Imported into QGIS?

I have a polyline drawing from AutoCAD that I would like to reposition manually, if possible. During my efforts so far it has been turned into both a tab file and shape file. The main source of ...
2
votes
1answer
29 views

Mapping out 3D points with QGIS2threejs

I have some points I would like to map out in 3D. The points were gotten from a GPS module athat was attached to a Raspberry Pi. This is the settings I used before starting qgis2threejs: This was ...
1
vote
1answer
32 views

Changing CRS in QGIS due to pop up window: "CRS warning! Warning: Input layers have non-matching CRS. This may cause unexpected results.” [duplicate]

I'm using GIS to map the movement of animals and their speed and density in different habitat types using shape polygons. When I got to the step ;Count points in polygon' a pop up window appeared ...
6
votes
2answers
55 views

Inferring lat/lon based on known location coordinates

I have a point dataset with a set of coordinates that is in an unknown projection. For some of these points I know the unprojected latitude and longitude. Based on these known data points, would it be ...
3
votes
2answers
35 views

Adding Excel file with degrees to map with CRS in QGIS?

How can I add a layer with X,Y in degrees (from an excelfile) to a map with CRS? I am using QGIS 2.8.2
1
vote
0answers
28 views

Same CRS but different units of raster cells in qgis

I have two rasters with the same CRS (WGS 84/UTM 34N). One is from a LiDAR scan and the other raster is created thru interpolation of point measurements by me. I would like to change the cell size to ...
1
vote
0answers
16 views

Convert Coordinate Notation tool

I am having trouble using the CCN tool. My data is a DMS 442315 1214598 and I need to be in DD to work with my county data which I know is in the correct format. I tried adding a new field then ...
3
votes
0answers
41 views

Choosing projection for routes that fall within two UTM zones? [duplicate]

I'm creating charts for routes that fall within two UTM zones; 30S and 31S. The offshore routes are in the Alboran / Balearic Sea - connecting Spain to Algeria. What projection should I use?
3
votes
2answers
72 views

What is a suitable map projection for the entire state of Idaho?

I am working with some sample GIS data for Idaho. The data is in geographic coordinates but I want it in projected coordinates. I am unsure how to address the issue of projection as Idaho crosses ...
-3
votes
1answer
34 views

Same coordinate system - shapefiles don't overlap [duplicate]

I have two shapefiles and two rasters (dem), and while I put them in the same coordinate system (Greek grid), it seems that they don't overlap. But one is the boundaries of a county, and another the ...
3
votes
1answer
34 views

Projection Problem on Oracle Spatial

I would like to transform SDO_GEOMETRY from WGS84 projection to my custom projection in Oracle Database. Details for custom projection is as follows: +proj=lcc +lat_1=40.5 +lat_2=37.5 +lat_0=25 ...
1
vote
1answer
25 views

Identify Hawaiian coordinate system

I've come across the following coordinates: x = 600907.76 y = 2437133 It's a coordinate located in Hawaii. I thought it was UTM, but the negative x coordinate makes me think otherwise. Anyone know ...
3
votes
0answers
38 views

Overlaying WMS in custom coordinate system with other layers in openlayers 3

I have a raster in a custom coordinate system (I added the coordinate system definition to the geoserver EPSG file so that I could choose it as the native projection. Now I would like to add it to a ...
4
votes
1answer
43 views

How to use Prolong Line feature with an input layer in WGS84?

I have a source point table in SRID:4326, and to make it look geographically accurate, I project my project file to SRID:2877 (State Plane CO) (layer still reports source CRS of SRID:4326). In order ...
3
votes
1answer
47 views

Exact conversion of ECEF to geodetic coordinates

I came across the paper "Exact conversion of Earth-centered Earth-fixed coordinates to geodetic coordinates", which describes a series of equations which can be used to calculate a set of geodetic ...
3
votes
2answers
82 views

How to change the coordinates of Shapefiles from another GIS platform to QGIS

I have over 800 shapefiles which when paired with google maps/bing maps, the point is off by at least 1000 km. Been scratching my head to make this work by changing the default CRS. (Previously was in ...
2
votes
1answer
51 views

How to use a png image as a correctly georeferenced background in order to trace lines from it?

I have a png image which looks like this and has some lines which I need to trace (the green and red lines): The coordinate system of the map from which the image is taken is EPSG: 3034. How can I ...
4
votes
1answer
27 views

Linking Data Frames with Different Coordinate Systems

I have a problem that I am hoping might have multiple solutions. I am working with research data that was collected on an arbitrary grid, with units in m, datum point of 1000E, 1000N. The grid is ...
3
votes
3answers
58 views

how to add grid coordinates in QGIS 2.12.0-Lyon in the print composer canvas?

The attached image is the municipal basmap created using QGIS. I was not able to add the grid coordinates in the print composer canvas. How do I add those coordinates?
0
votes
0answers
22 views

Can I use the bounding coordinates of a coordinate system to determine the coordinate system for undefined coordinate values?

I have a table with coordinates that are undefined, but I know they could be in several different state plane zones/datums. I am thinking I can possibly use coordinate ranges to assign the coordinate ...
0
votes
1answer
33 views

Using different CRS for map and data?

I followed the tutorial from http://schoolofdata.org/2013/04/27/creating-a-map-using-qgis The France map is from NaturalEarthData and tour de france data is from another source. They used different ...
3
votes
1answer
101 views

Difference between datum and ellipsoid for geodetic coordinates?

Looking at the Wikipedia page for the North American Datum, it seems to imply that the datum is completely defined by the ellipsoid, which defines the major/semi-major axes, flattening, etc. For ...
0
votes
0answers
32 views

GPS coordinates of a point between two known points

I am looking for an algorithm for finding GPS coordinate of a point on a straight line defined by say points p1 and p2 at distance r from p1. GPS coordinate of p1 and p2 are known. I searched a lot on ...
3
votes
1answer
35 views

How to find Coordinate System of datasets inside MDB and GDB

I have been given some ESRI personal geodatabase files (MDB) and file geodatabase files (GDB). I don't know the coordinate system(s) for these files. Is there a way to do this without using ESRI ...
3
votes
1answer
125 views

Converting coordinates in Florida, USA?

I have an point location and the information given is: Easting: 519122.06 Northing: 1290630.07 Original thought was it's UTM, but does not appear to be correct because I know the point needs to be ...