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
1answer
59 views

QGIS Processing Input CRS from Input Layer

I'm creating a Processing algorithm that requires the user to input several parameters including an input layer and an output CRS. At present, the tool defaults to SRID 4326. I'd like for the CRS ...
2
votes
0answers
136 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 ...
0
votes
0answers
7 views

SegFault on create an EmptyDataSource From a typedef

I had to create a specific type of point, in order to do that I create a function that create a layer from shp file and data extract of the Code : typedef bool ( *createEmptyDataSourceProc ) ...
1
vote
0answers
25 views

Converting a geocentric latitude to a geodetic latitude [duplicate]

I'm working with a 3D model of the earth (WGS84). The input to my problem is a geocentric lat-long. Is there an efficient way to convert this to a geodetic lat-long? My initial attempt to solve ...
0
votes
0answers
25 views

France Coordinate Systems in Manifold?

Is anyone ever imported into Manifold files in the new French system? Manifold propose RGF93 but apparently I can not specify the area described (CC47).
0
votes
0answers
29 views

Wrong axis order in geotools crs when reading from EPSG:4326 [duplicate]

Map<String,Object> params = ...; // postgis params DataStore dataStore = DataStoreFinder.getDataStore(params); SimpleFeatureCollection collection=...;// collection to save SimpleFeatureType ...
6
votes
2answers
256 views

Difference between CoordinateSystem and CoordinateReferenceSystem

What is the concept of Coordinate Reference System. You know GeoTools has a FeatureType class having getCoordinateReferenceSystem() function and also a CoordinateReferenceSystem class having ...
1
vote
0answers
29 views

Integrating New Coordinate System as Default in ArcGIS for Desktop?

I have a database in Postgres whose Coordinate System is a local one. I mean it is not defined as default in ArcGIS 10.2 for Desktop. On the other hand I have ArcGIS with SDE working over Oracle. ...
1
vote
2answers
48 views

Is publishing geodata in unprojected latlon coordinates better than a local UTM projection?

This is meant as some kind of reference Q&A. Unless I am working with truly global data, I always prefer projected, local, metric coordinates so that calculations like area or distances are "...
0
votes
0answers
92 views

Problem using EPSG:3395

in my application I use OGC:CRS83 for the coordinatereferencesystem, but now I had to change it to EPSG:3395 when I call : mQgsCoordinate->createFromOgcWmsCrs("EPSG:3395") there is nothing in ...
1
vote
1answer
106 views

Is setting raster CRS in QGIS georeferencer useless? Still have to choose the same for target SRS?

I'm trying to move out of ArcGIS into QGIS permanently for basic operations, so be patient please. Here is the problem. I'm trying to georeference a topo map in EPSG:22523 (Corrego Alegre UTM). I did ...
0
votes
0answers
60 views

How to get a layer's projection

I'm using GeoNetwork 3.0 where users can upload their own layers from the interface to my GeoServer. GeoNetwork 3.0 uses OpenLayers3. For my application, I need to determine the crs from this layer so ...
2
votes
1answer
559 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 ...
3
votes
1answer
121 views

After how much distance does the x,y coordinate system become noticeably distorted?

I'm working with maritime sensors that give information of moving objects it detects, in azimuth, range and elevation, and we convert it to x,y coordinates for our application to be able to process it....
1
vote
1answer
117 views

Polyconic Projection for China?

I have a set of locations/points and I am trying to compute the nearest distance of these points from a Polyline. The points and the polyline lie in China and the Geographic Coordinate System is WGS ...
4
votes
1answer
161 views

How do I find/define a projection that gives me exact relative positions inside an area?

Assuming that a set of positions are all inside a 5km square area: How do I find/define a projection to reproject the positions, so that the relative positions between the now reprojected positions ...
4
votes
1answer
111 views

Coordinate Projection Issue in ArcGIS Pro

From an issue with buffer overlaps, there was this weird problem occurring with an intersect not matching up with the buffers in ArcGIS Pro as shown below: Upon opening the same exact buffer, with ...
0
votes
1answer
25 views

Is label offset only possible in PCS?

I'm working with ArcGis 10 and I need to show the name of the streets along the street line. I want to increase the distance of the label from the line and I saw in the Label Tab I can control this by ...
1
vote
1answer
76 views

How to get correct lengths when switching from GCS to PCS?

I'm working on ArcMap 10 and need to get the lenghts (in meters) of the segments composing my line feature class. GCS of the line is WGS_1984. Extent of this data should be: Left 11.236520 dd, Right ...
3
votes
1answer
123 views

What's going wrong when I reproject raster in EPSG:32115 in QGIS?

I wish to make a QGIS project with an orthoimagery layer and a vector layer of GPS points. I'm using QGIS 2.8.2, 64 bit, in Windows 7 on a Lenova t430 laptop. Raster is in EPSG: 32115 (mercator, NAD83,...
0
votes
0answers
68 views

Coordinate Transformation Issues

We are a GIS department using ArcDesktop and SDE 10.3. We are receiving service requests through a 3rd party web application (seeclickfix) that records the service request in WGS 84 lat/long. The ...
1
vote
1answer
57 views

Extracting *.tif agricultural area from shapefile?

I am attempting to extract from an image using Esri shapefile that is in the zip file RR_KZKD2012 In ArcGis the spatial reference is Projected Coordinate System: WGS_1984_UTM_Zone_43N. Then am using ...
2
votes
2answers
98 views

What CRS is the USGS Global Land Cover Characteristics Data Base?

I have trouble bringing land cover data from the USGS into a "decent" coordinate system. I obtained an .img file of the "Global Land Cover Characteristics Data Base Version 2.0" from http://edc2.usgs....
0
votes
1answer
90 views

Importing shapefiles with unknown spatial reference into feature dataset?

I was wondering if I import shapefiles with unknown spatial reference into a feature dataset, with desired coordinate system, would that work?
0
votes
0answers
126 views

Feature Points Shapefile missing Spatial Reference Information

I'm working with ArcMap 10 and I have a feature points shapefile from the Florence (Italy) municipality open data (http://opendata.comune.fi.it/statistica_territorio/dataset_0040.html). Each point is ...
0
votes
2answers
71 views

Are State Plane Coordinates always derived from longitude and latitude?

Do state plane coordinates always begin as longitude and latitude? In other words, they are not another system that can be calculated without Long. and Lat., correct? I guess I'm saying, back in ...
1
vote
1answer
45 views

How to display the map within two longitude lines

I am new to GIS and I try to use the following code to display a pacific-centered world map. +proj=robin +lon_0=-198 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs However the map ...
4
votes
1answer
127 views

Point Coordinates Conversion with unknown system

I've been using QGis for few weeks now. Although this site always came very helpful, I can't find solution to my recent problem: I have few points, and know their coordinates in "WGS-84" and "ISN-93" ...
3
votes
1answer
137 views

Problem with distance in QGIS

I start a new project with base on OpenLayers plugin but if I check the distance on QGIS with distance tool (I choose a straight road) I view 5.466m on QGIS and 4.300m on google (by walking). How is ...
0
votes
1answer
185 views

Postgis geometry column with different srid

I have a table that has geometry column named the_geom. I set SRID value to 29903. And I used Openlayers api to view data on map. I set map srid as 29903 and works well. But if I need to show my data ...
0
votes
1answer
127 views

Using CAD data that is not to be projected in ArcMap?

I need to incorporate CAD data into my geodatabase but the usual steps seem to require defining a projection or projecting the data in some way. All of my geodatabase's feature classes are in ...
0
votes
1answer
284 views

GeoTools, convert CRS for Google Maps

I'm trying to use GeoTools to convert coordinates from EPSG:3857 to various CRS, in order to display WMS layers on a Google Map. For example, I want to display a layer in the EPSG:4326 CRS. I have ...
2
votes
1answer
628 views

How to access Leaflet EPSG:3857 coordinates?

I read everywhere that Leaflet is internally using a spherical web mercator (EPSG:3857), but whatever I try I get either Lat/Lon (EPSG:4326) or strange coordinates I dont understand: map.getBounds()....
1
vote
1answer
112 views

QGIS for geophysical surveying?

I need to make 30x30 and 20x20 grid layouts with co-ordinate points in the corners. These points then need to be relayed to a GPS to be able to set the grids out in person and then survey them. The ...
1
vote
1answer
299 views

Layers with the same CRS in QGIS do not line up

I am busy with a project where I have to layer a .dxf and a .kml file but the layers are not lining up. The .dxf file's coordinates are completely wrong and the scale also does not appear to math up ...
0
votes
1answer
68 views

error 00289 while projecting raster

I tried to project satellite image of pixel size 2.5m*2.5m. It's in wgs84 UTM zone 44 North. I tried to project it to nepal_87 but failed. The error massage displayed was 'error-000289,failed to alter ...
1
vote
2answers
104 views

Coordinate transformation in LAStools?

LAStools program only limited to UTM platform for coordinate transformation (las2project, las2transform). Is there any other ways to transform coordinate for local projection in LAStools? For example ...
1
vote
1answer
119 views

Converting grid co-ordinates to GPS co-ordinates

I need to convert grid co-ordinates from an old document to GPS co-ordinates that I can plot into Google Earth and ArcGIS. Here are the instructions: 'It was unfortunately not possible to produce ...
1
vote
2answers
62 views

Load USGS DRG into QGIS

I'm trying to load some DRG data from the USGS into QGIS. The source data uses UTM coordinate and I can't seem to get it to overlay with WGS 84 vector data. I (think) I've followed the recommended ...
3
votes
2answers
78 views

How to fix the error between two coordinate systems?

How do you think the shift of line is due to morphological change of river? Or it is due to deviation between two coordinate systems? Please point out !!
2
votes
1answer
128 views

How to obtain WGS84 or Projected Bounds for given EPSG in postgis?

On the http://spatialreference.org, for almost all SRS are definied WGS84 Bounds and Projected Bounds. How to obtain this bounds from postgis? Spatial_ref_sys does not contains this information.
1
vote
0answers
90 views

rasters written with gdal show up with units of meters when they should be degrees

I have some SMOS soil moisture data packaged in a netcdf format distributed by "cp34-bec". I have been able to use GDAL to extract this data as a raster layer, using a projection i think is ...
0
votes
2answers
70 views

Which co-ordinate reference system should I use for the British Isles?

I'm wondering which co-ordinate reference system would be the best to use for a project covering the British Isles, since the UK and Ireland have separate systems - British National Grid and Irish ...
1
vote
1answer
975 views

What is/are the coordinate systems used in South Africa?

What are the principal datums and projections used in South Africa including the names of geodetic datums and their projections?
0
votes
1answer
74 views

Output of Add XY Coordinates?

I am trying to get the coordinates of the coastline. I have made a shapefile with points selected along the coastline, the coordinate system I have the shapefile under is WGS 1984 UTM Zone 30N. I have ...
1
vote
1answer
155 views

Adding Vertical Reference in Python to ArcGIS feature dataset

I am creating a python script to generate a terrain. In the process I am creating two feature datasets. However, in order to successfully create this FD, i need both horizontal and vertical datums. I ...
0
votes
0answers
32 views

Getting ArcGIS Desktop to understand LOAC so it calibrates coordinate systems correctly?

So I downloaded some data from the 2011 UK Census and I want to add it as a layer on my basemap. I couldn't see it on the map although it was in the Contents tab in ArcMap, so I zoomed out to full ...
1
vote
0answers
76 views

Projections way off on data imported into QGIS?

I have elevation data as a .shp from the USDA ARS and Hi-Res Orthoimages (Mystery Projection (UTM 15N?)) from the USGS website as geoTIFFs (plain NAD 83). I am trying to project all of the images ...
2
votes
2answers
118 views

When does a local system introduce errors in a map due to the earth's curvature?

If the extent of a map is very small, like a building plan, there is no coordinate reference system used. To which scale/size of building is that acceptable? Of course it depends on the precision ...
0
votes
1answer
98 views

How to create a customized grid with two coordinate systems?

I need to put two grids on a map - one in NAD27 State Plane CA Zone 5, and the other in NAD83 State Plane CA Zone 5 (feet) and have the grids be formatted properly. If I go into the Data Frame ...