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.

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1answer
17 views

How to tell what co-ordinate system a WFS server is giving?

I got a GML file from an ArcGIS-based WFS server and converted it to GeoJSON using Ogre (online ogr2ogr), but then got very strange results from that GeoJSON file. Here's the link to the ...
25
votes
3answers
10k views

Reprojecting all geometries in PostGIS table?

I created a spatial table with SRID:4326. Now I want to change total projection to SRID:32644 into a new table. The old table should remain unchanged.
1
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1answer
26 views

Longitude difference to Meters

I have been trying to find an effective method (be it an equation or table filled with values) that would be useful for converting differences in longitude values into a distance in kilometers. It ...
3
votes
1answer
42 views

What's the best way to handle a 'Site Datum' in QGIS?

So I have a client with a site datum, which is to say they have an arbitrary coordinate reference system with coordinates between -1000 and 1000 in X and Y. I have a list of ~20 coordinates that maps ...
2
votes
1answer
25 views

Direction of the Y axis in OpenLayers

A have an openlayers map with with two layers: a Tiled image layer (served through zoomify protocol) and a Vector layer. I draw boxes/rectangles on the image then get their geojson coordinates and ...
2
votes
1answer
910 views

Which of EGM96 geoid or WGS84 ellipsoid fits the earth better?

ImageCredit Question If we separately add up |H| and |h| over the earth surface, which of the sums come out smaller? Background There is a phrase in the tag description of "ellipsoid" that says "...
0
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2answers
14 views

Problem transforming data from GCS Krasovsky to GCS WGS84

I am having trouble transforming data from GCS_Krasovsky_1940 to GCS_WGS_1984 in ArcGIS 10.4.1. I'm using the Project tool, but the geographic transformation parameter is left empty and I would expect ...
0
votes
0answers
20 views

Planar vs. Geodesic large differences

Using ArcMap aerial image in WGS84 my line measurements in Planar seem to come out very high, while Geodesic seems accurate. I am concerned about this and wonder why Planar measurement does not match ...
1
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1answer
44 views

How to get the extents of a spatial reference system?

In general, how does one get the valid extents of a spatial reference system? In particular, is there a way using the Proj.4 library? I attempted to use the information from the epsg.io website, but ...
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1answer
377 views

Changing from one coordinate system to another without re doing

I'm new to this. Can I change from the Nigeria Mid Belt system to the Nigeria West Belt system easily, or do I need to recreate my project?
2
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2answers
32 views

Python, Describe.spatialReference errors

Having trouble getting my code to work. Keep getting IOError that my parks.shp doesn't exist....not sure I understand what this is saying. import arcpy mxd = "D:\...\TravisCountyAustinTxx.mxd" ...
0
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0answers
25 views

Get two Shapefiles into one extent

Using QGIS 2.12: I have two shapefiles. One is a: xMin,yMin 4452526.72;5331472.42 : xMax,yMax 4453161.88;5332883.26 extent, tho I have set it to GK (DHDN) the other one is a: xMin,yMin -46.874;-6....
2
votes
1answer
734 views

Create Fishnet on Landsat footprint? [closed]

I have a Landsat footprint polygon shapefile that I simply want to create a 6 x 6 fishnet on. I thought this would be simple, but every time I run the tool I get a fishnet output that extends longer ...
2
votes
3answers
40 views

Generate Proj4 definition from given parameters

I'm an archaeologist and I'm struggling with the generation of a reference coordinate system for georeferencing the Spezialkarte der Osterreichisch-Ungarischen Monarchie (XIX century). I've found the ...
4
votes
0answers
73 views

Why different transformation behaviour ArcGIS Pro 2D/3D layers?

I am working with ArcGIS Pro and have noticed a strange difference between the co-ordinate transformation of 2D and 3D layers. Here are my transformation settings: I have the same layer ...
7
votes
1answer
25k views

How to change the unit of measure from degrees to meters in QGIS?

I am running QGIS 1.7.0 on windows, and I donwloaded a shapefile of census block group boundaries from TIGER. This file appears to be in the WGS 84 coordinate system, and when I open it in QGIS the ...
2
votes
1answer
554 views

Query all Object within n kilometer Radius with Hibernate Spatial?

I use hibernate spatial attach a geolocation to a car. My card domain class looks like this: import com.vividsolutions.jts.geom.Point class Card { String name Point location } My program is ...
0
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0answers
12 views

Conversion from 32643 to 4326 in Sql server

I am working with SQL server 2012 Spatial Database and i need to convert from Spatial Reference System 32643 to Spatial Reference System 4326. Is there any spatial function for this type of spatial ...
0
votes
2answers
58 views

How do I convert XYZ coordinates to another projection system

I am trying to convert between coordinate systems in QGIS. I have a point file in NZGD49 coordinates (EPSG:27200) (referenced to the geoid) which I am trying to convert to NZGD2000 coordinates (EPSG:...
0
votes
1answer
219 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...
1
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1answer
264 views

Can layers with different extents in arcmap 10 be made to line up?

I am currently trying to get some insect sampling coordinates that are represented by points to project on top of a polygon that shows all the different plots of land in a ranch. The coordinates for ...
0
votes
0answers
27 views

Determining scale of downloaded data (shapefile, raster, etc)?

When downloading digital data (either shapefile, raster, layer, GDB etc.) how do you determine the scales? Is there a simple way? I know scale definitions are different for geographers and ...
-1
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1answer
21 views
0
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1answer
32 views

Global Projection in Meters

Currently I only have a GCS (WGS84), but it only allows for decimal degrees. Is there a global projection or CRS that would allow me to use Meters as a measurement? I am using this for a tool that ...
0
votes
0answers
7 views

Openlayers switches coordinates of bbox

I do have two questions: First, I have a custom projection that works fine with a arcgis tiled service. However if I add any other wms, the bounding box (bbox) in the url is incorrect. Second, The ...
1
vote
2answers
66 views

Why can't QGIS recognize the right Layer CRS?

I have a vector layer (shapefile), that I projected with ArcMap 10.4 into UTM33 (EPSG: 25833). If I load this layer in ArcMap, 25833 ist always recognized as the CS of the layer, as expected. But ...
3
votes
2answers
4k views

Choosing Geographical Coordinate System and Projected Coordinate System for India?

I want to create spatial data for entire India. Usually I use WGS84 as GCS and UTM zones for PCS in the places in India, but when I have to create the spatial data for entire India, I get confused ...
3
votes
2answers
53 views

Conversion from WGS84 to UTM NAD83

If all my data is in UTM NAD83 Zone 10 and I get new data in GCS WGS 1984 do I have to reproject the WGS data to UTM NAD83 Zone 10 for it to align correctly or can I just bring it into an mxd that is ...
2
votes
3answers
3k views

Coordinates of raster image from .TAB file

I have got a raster image (tif) from a mapping site and an associated .TAB file. I am trying to correctly map it into CAD/3d model - which I know is set up to the correct coordinates. The .TAB file ...
3
votes
1answer
87 views

Visualizing netCDF file with unknown projection

I'm having a tough time visualizing a netCDF file with poor metadata in ArcMap, which is probably not a surprise. I know the file to contain ozone concentrations over the United States. If I try to ...
1
vote
2answers
308 views

Adding points defined by Latitude and Longitude to map using QGIS?

I have an OS map on which I want to display points defined by Latitude and Longitude, but the map coo-ordinates have values I do not recognise or understand. The image shows the map, with my first ...
1
vote
1answer
33 views

GADM Phillipines data won't align to WGS84

I'm currently working with several datasets in QGIS that lay 100% perfect when I match it on Google Earth using its inter-app plugin. However, when I load administrative regions from GADM, the entire ...
0
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0answers
25 views

QGIS reads CRS different [duplicate]

I have a data frame with more than 100000 observations. I'm trying to convert this data into a shapefile in R. I give some CRS to data in R but when I open the shapefile in QGIS I see a different CRS. ...
2
votes
2answers
48 views

Projection: conversion of coordinate pairs in Python

Google Translated I am using QGIS and wish to automate the export of a map (an existing project) to which I add a vector layer (representing a construction zone) in pdf format. The problem is: The ...
5
votes
1answer
463 views

Hexagon binning using Google Maps

I have a bunch of geolocated points that I am looking to cluster on a google map using hexagons. These clusters will be stored in a db for quick retrieval and will be reduced to a single point and ...
4
votes
5answers
3k views

Convert from WGS84 to GDA94/MGA94 on iOS

I have a mobile app (iPhone/iPad) for recording data and taking notes, including photographs, and a government client needs GPS coordinates attached to each photo. They require coordinates in the ...
2
votes
1answer
80 views

How can I change the origin (top left corner) coordinates of a raster using PyQGIS?

I am developing a python plugin for QGIS. The purpose of the plugin is to properly open an HDF5 dataset as a raster. Opening and displaying the raster can be done without the need for a plugin, ...
1
vote
2answers
112 views

How can I make the UTMs of different datasets uniform?

I have wind datasets for every U.S. state and want to merge them. I found out that these datasets use different UTMs. So I want to make the UTMs uniform. How can I do that? This can not simply be done ...
2
votes
1answer
20 views

Appropriate projection for US distances?

I am generating distances between crash sites (points) and urban areas (shapes) and am wondering what the best projection is to use for this task. The area of interest is limited to the U.S. (Alaska ...
3
votes
1answer
39 views

GRASS on QGIS is generating new CRS

I am experiencing a strange problem by using the GRASS toolbox on QGIS 2.14.3 Essen. Even if in settings>options>CRS I select to use the project CRS when creating new layers, the results of GRASS ...
0
votes
0answers
7 views

Reprojecting Modis data using MCTK Aand MRT

I am trying to re-project MODIS product MOD15A2H Fpar product. I need my data to be georefrenced so That I can create ROIs and find pixel values. However, I am having trouble georeferencing the data ...
2
votes
1answer
30 views

Choosing map projections specifically for San Francisco Bay Area?

I am asking because I am not familiar with specific map projections for the San Francisco Bay Area.
2
votes
2answers
514 views

Tiled raster image to be placed in an OSM/ Leaflet.js map

I have a mapoverlay in a custom projection which I need to add as a layer to an Openstreet map within a website. Since I was not able to change the projection earlier, I decided to manipulate the ...
1
vote
2answers
101 views

Intersecting three polygon layers in ArcGIS?

I have three data sets of San Francisco, TerraSAR-X, ALOS-PALSAR, Radarsat2. I have extracted KML files using Envi Sarscape. In order to find the intersection of these areas, I have converted ...
1
vote
1answer
479 views

Identifying coordinate system of San Francisco data?

I just found a dataset of trees in San Francisco, but I'm unable to determine the system used for the coordinates. Here are some samples: 5998894.045593,2119007.035323 6018697.2048701001,2097076....
1
vote
1answer
190 views

How to detect coordinate reference system (CRS)? – I cannot display two vector layers in QGIS at the same time!

When I in QGIS try to display layer (a) together with another layer (b) that differ in their CRS it doesn’t work. Both are vector shapefiles. I have tried both with using QGIS ‘on the fly’ CRS ...
2
votes
1answer
33 views

Clipping layer when using new projection in QGIS?

I'm having trouble clipping a shapefile in QGIS so I'll take you through my steps. I've downloaded the land shapefile here http://www.naturalearthdata.com/downloads/10m-physical-vectors/ When I load ...
0
votes
1answer
27 views

How can get data unit by ArcPy?

Is there a way to according to the data's spatial reference to get the unit of data, for example: wgs1984 → Decimal degrees, UTM54 → Meters.
3
votes
1answer
128 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 ...
10
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2answers
2k views

Is there a standard for the specification of .prj files?

We use shape files for data exchange. I've looked at the .prj files: different programs produce different prj files. Is there a standard how the parameters must be specified in a prj file? AFAIK the ...