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)

3
votes
1answer
91 views

QGIS “ERROR 6: No translation for Lambert_Conformal_Conic to PROJ.4 format is known.”

I am trying to clip a county DEM file using the PLSS Section shape files as mask layers... that is, I want it clipped to sections so that I can load my DEM into QGIS one section at a time, without ...
0
votes
1answer
94 views

How to inverse Y axis

I have a SQLlite database containing cached tiles with X,Y,Z fields and I want to use it in MapCache. My Y field is appearing upside down in Google tile index but I want to inverse it like this: ...
5
votes
5answers
2k views

Can I copy an entire geodatabase with relationship classes and domains and reproject all feature classes from wgs84 to state plane?

I have an SDE geodatabase with several feature classes, tables, relationship classes, and domains. All the feature classes are currently in WGS84 coordinate system. I need an exact copy of the ...
3
votes
1answer
121 views

Plotting spatial data when two spatial objects have different CRS

I have a spatial polygon object and a spatial points object. The latter was created from xy latlong data vectors (called latitude and longitude, respectively) in a dataframe, while the former was ...
1
vote
0answers
40 views

How to shift a CRS by an observed offset

I have a drone image is which is geo-referenced over a Google Sat. image. These align well, and both use WGS84-Pseudo Mercator (EPSG:3857). I have a set of data points in a shape file which are ...
1
vote
0answers
52 views

Leaflet CRS.Simple or CRS.EPSG3857 conversion Problem

I'm using v-leaflet (0.61) , a vaadin plugin, to visualize some layers over a map. Clicking on the map, I create a wms query to geoserver. The query needs some parameters and one of them is the bbox. ...
2
votes
1answer
91 views

How to clear spatial reference identifier?

I created a table in oracle with a sde.st_geometry column. I followed the instructions of ArcGIS help to register the table into geodatabase. My table creation statement is: create table ...
2
votes
1answer
63 views

Unknown Coordinates

I'm new at gis. I'm using Arcgis 10.2.2 and trying to geocode some addresses. I used a geocoding service which gave the coordinates in this format: POINT(102778.307715144 105888.168842117) I don't ...
4
votes
1answer
51 views

proj.4 definition for (obsolete) UK War Office “Italy South” grid

I'm helping a friend convert his late father's war diary coordinates to WGS84. I have a proj.4 definition that appears to work in QGIS, but if I transform a scanned map with gdalwarp, it's not even ...
1
vote
2answers
89 views

conversion differences going from 4326 to 26710?

there are two coordinate systems in question: "CRS 1" = EPSG:4326 (good ol WGS84) "CRS 2" = EPSG:26710 (UTM NAD27 Zone 10 (specifically, zone 10S but they don't seem to differentiate) For the ...
1
vote
1answer
87 views

mosaic dem with multiple coordinate systems

I'm sure this is a basic question, but I'm struggling to mosaic multiple DEMs (~40) into one large raster. The DEMs are 30m NED rasters from the NRCS data gateway, for the New England region. They are ...
37
votes
3answers
46k views

Algorithm for offsetting a latitude/longitude by some amount of meters

I'm looking for an algorithm which when given a latitude and longitude pair and a vector translation in meters in Cartesian coordinates (x,y) would give me a new coordinate. Sort of like a reverse ...
3
votes
2answers
51 views

Generic term for CRS axes?

We're making a light web front to a database, and I saw this in a test screenshot: Despite those coordinates being nowhere near North America, the "latitude/longitude" label for those coordinates ...
4
votes
1answer
338 views

NAD83 and NAD83 State Plane

I'm struggling with a projection question. I have some data in California State Plane and am trying to align a NED with NAD83. I thought these would just natively align, but they don't seem to ...
1
vote
1answer
42 views

Aligning data in GCS_North_American_1983 and GCS_North_American_1927 using ArcGIS for Desktop?

I have tried everything that I have found on this site so far and nothing has worked! I have used ArcGIS for 3 years but had never had to mess with coordinate systems as the 1st company I worked for ...
1
vote
0answers
67 views

Projection problems when importing .kml from Google Earth to QGIS

I want to open several points that I exported from Google Earth as a .kml in QGIS for further use. I can import the data and the points are displayed but something must be wrong with the projection as ...
3
votes
1answer
92 views

Reprojecting between NAD27 and WGS 84 part III

I am trying to perform a reprojection for data with datum Nad27 to WGS84 datum. According to AndreJ in some previous questions in Stackexchange (CRS reprojection for instance) QGIS uses internally by ...
8
votes
3answers
225 views

What coordinate system is this netCDF raster?

I obtained a netCDF raster file, but I couldn't get any metadata to get the name of the coordinate system the raster has been built on. The raster itself doesn't have any coordinate system embedded. I ...
0
votes
1answer
136 views

How to project feature class located into 3 UTM Zones?

i have created a silverlight API web map application,for Saudi Arabia country, i have created a 3 search button, once search for "X,y", the problem with me is to how to define a probability projection ...
0
votes
0answers
12 views

Deviated InfoBox - Geojson

I tried to showing info-Box after click (onmouseclick), that is goes well but info-Box's location is far away from my geojson area. Can Someone explain to me what happen in here?
20
votes
6answers
4k views

How do you best deal with data that spreads across UTM Zones?

I have data that spreads across two UTM Zones GDA/MGA94 UTM Zone 55 and 56. I have layers such as a cadastre, roads, pipelines etc where I want to store measurements like lengths and areas in metres ...
1
vote
1answer
153 views

ITRF2008 to WGS84 Datum Transformation in ArcMap?

If I have data in IRTF2008 as shapefile is it possible to change this to WGS84 and how? The need for this comes when trying to display the data in a third party program that doesn't recognize the ...
0
votes
0answers
68 views

Custom CRS in Qgis web - client

Hello I'm abit new here and I hope I'll even set the question right. Recently I've started to work on a project that will include displaying maps in qgis-web-client. At the moment I've set up the ...
2
votes
2answers
47 views

Coordinate Not Match - Convert Shapefile to Geojson

I'm a newbie at GIS programming and I have a problem with file conversion. I've tried to convert shp file to geojson, and the coordinates do not match. But when I try to convert it to kml, it goes ...
4
votes
1answer
314 views

Cannot compute area of shapefile in field calculator of QGIS?

This shapefile represents the counties of NM. I am trying to compute the area of each polygon (yes, I know there is an area field, but this is a simpler example of a problem I'm having which doesn't ...
0
votes
1answer
80 views

How to set the spatial reference to a OGR layer using the Python API?

I create new a Ogr Layer with the Datasource.GetLayer() method: driver = ogr.Open(input_file).GetDriver() datasource = driver.Open(input_file, 0) input_layer = datasource.GetLayer() If the input ...
4
votes
1answer
29 views

What is the level of error I should expect when using a NAD StatePlane CRS from an adjacent state?

I am adding Georgia data to my GIS database and, unlike the California data I've added, have decided to use my existing EPSG:3361 (South Carolina StatePlane) coordinate reference system for ...
3
votes
2answers
104 views

Import Google Maps locations to ArcMap

I have a problem with importing a list of coordinates to ArcMap. I have a shape file of regions of Chile and I would like to add a list of locations with coordinates I got from Google Maps. The shape ...
0
votes
2answers
50 views

I am looking for a direct long. to X lat to Y map of earth

Occasionally I like to drop raw coordinate data into excel and do a scatterplot. It comes out quite a bit like cylindrical projection but not quite. The distortion near the poles is a bit more ...
0
votes
1answer
153 views

Scaling x,y coordinates in proj4

This question was asked before, but without answer. Let's say we have mercator map with given resolution (for simplicity in centimeters). Now let's get coordinates of (lat,lon) = (50, 15): $ proj ...
0
votes
1answer
74 views

Precision loss when trying to select the latitude and logitude coordinates from an sde.ST_GEOMETRY using SDE.STX() and SDE.STY() functions

In an oracle 11g enterprise geodatabase I am trying the following: INSERT INTO MySTATION (STATION_ID, DB_VERSION_NU, CREATED_DT, MOD_DT, SHAPE) VALUES (1, 0, sysdate, sysdate, ...
0
votes
1answer
87 views

Overlaying two shapefiles and projecting one of them from Geographic to Projected Coordinate System? [duplicate]

I am trying to project a shapefile which is in Geographic Coordinate System i.e. Geocentric Datum of Australia 1994 to a Projected coordinate system i.e. Map Grid of Australia Zone 55 using GDA 94 ...
0
votes
2answers
46 views

US Geological Survey Standard Projection?

Is there a standard or default projection on maps created by the US Geological Survey (USGS)?
1
vote
0answers
42 views

SRS in GeoServer and OpenLayers

I have a shape file with projection WGS84,when I added it to GeoServer,the Native SRS is Unknown and for Declared SRS I wrote EPSG:4326. However, the shape file became a mass if opened in Layer ...
3
votes
1answer
65 views

Create Archimedean spiral with geographic coordinates

I don't know if this is the right place to ask but here it his. I want to create an Archimedean spiral based in some location. Lets say I have this set of geographic coordinates (48.860770, ...
1
vote
2answers
304 views

Proj4js Problem in converting coordinates from google mercator

I am a really beginner into web-cartography, so sorry if this subject is rudimentary or basic but I truly search for a long time and I am still stick in it. So the problem is: I don't understand why ...
2
votes
1answer
124 views

How to get the Parameters for a Lambert conformal conic projection CRS in QGIS 2.6

I am currently having some trouble adding the CRS to a vector file that I want to re project to WGS84/UTM. The shapefile is using Lambert Conformal Conic Projection; ITRF92 horizontal datum and GRS ...
3
votes
0answers
44 views

Is there a way to expose Spherical Mercator Lat Lon in Google Map API?

The map tiles in the Google Maps are in Spherical Mercator projection (srid 900913), but in the API the methods report coordinates in Lat/Lon WGS84, e.g. map.getCenter(). Is there a way to return the ...
1
vote
1answer
51 views

Adding geometry to QgsVectorLayer with lon/lat coordinates

I'm creating a custom Qt app that uses pyqgis for showing data on maps. I have successfully created a map canvas that shows a world map from a WMS server. Now I'd like to overlay data on this map. ...
3
votes
0answers
65 views

Statistically comparing two sets of coordinates [closed]

I have been given a task to compare two sets of points, one set being a set of predetermined points, on the other being a set of actual points that were taken in the field. I have to compare these ...
3
votes
3answers
2k views

How to define ITRF 92 and ITRF 2008 using Proj4 parameters in QGIS?

I know how to define a CRS, but this particular one is giving me a headache. I was unable to find the EPSG code at spatial reference. The main reason for asking this is that raster and vector data ...
2
votes
0answers
42 views

Problem when converting to LCC projection

I am very much so a beginner.. but here goes. I have two maps that should line up with each other, but their projections are different. I've tried to use the gdalwarp utility to match them up, but ...
3
votes
3answers
226 views

Which equal-area projection to use for UK?

I have a bunch of UK polygons that are saved in my PostGIS database as WGS84 projection. I would like to calculate the area of these polygons using st_area. According to this answer I can save these ...
3
votes
2answers
3k views

Meridian convergence. True north, magnetic north and grid north

I'm having difficulty wrapping my mind around meridian convergence, the horizontal angular distance between true north and grid north. Say I want to determine if a feature lies to the east or west ...
3
votes
1answer
44 views

Where are the elements of an ArcGIS SpatialReference as a string representation defined?

This seems absurd, but I cannot find any documentation on what the various elements mean in the string representation of an ArcGIS SpatialReference object. The first part is obviously the Well Known ...
4
votes
1answer
494 views

How to specify coordinate reference system (CRS) for scalebar that is different to project CRS?

Is it possible to specify a coordinate reference system (CRS) for the scalebar that is different to the project CRS? For example, my project CRS uses geographic coordinates (lat/long), the reason ...
0
votes
2answers
36 views

Openlayers2 checking coordinate system of WKT or KML file

In my Openlayers2 based project I give the possibility for users to upload their own features in KML file or with a WKT string. I only want to accept features with ESPG:4326 coordinates. Otherwise a ...
4
votes
2answers
1k views

How To Use Tiled Map Services with Different Spatial References in ArcGIS API for JavaScript?

I have the following code fragment in an esri page to try and change basemaps, the following code works, unless the next basemap layer uses a different spatialreference. if (baseMap) ...
6
votes
4answers
493 views

Where should I start advanced GIS learning

I am relatively familiar with most of the GIS stuff. I develop GIS applications as well with open source offerings. Still I find some lapses in my theoretical knowledge in GIS. What resources can you ...
2
votes
2answers
117 views

Adding * .prj file to output via Python script tool that creates fishnet?

I'm a new python user. I wanted to make a tool box like fishnet in ArcGIS 10.2. Everything, works fine. However, at output there is no .prj file, although spatial reference was defined at the tool. ...