Tagged Questions

1
vote
1answer
52 views

Why do points shift when reprojected from WGS84 to a state plane coordinate?

We have a Trimble unit we use to collect equipment. We collect the data in WGS84 and differentially correct it and then reproject it to a state plan coordinate system. The points always shift the ...
3
votes
1answer
49 views

Best way to create a georeference and projected data from a hand-drawn maps of mythical village for use in spatial stats training modules

I am preparing datasets for students in a spatial statistics course for a module on spatial autoregressive models. We will use ArcGIS 10.1. The first dataset will correspond to a mythical ...
3
votes
1answer
93 views

What to set spatial reference to after projecting to GCS_WGS_1984

I have a shapefile containing some sort of vectors or polygonal chains. This file is in the GCS_CH1903 geographic coordinate system (it is not specified though... if I import it into ArcMap it says ...
1
vote
1answer
36 views

Modify CRS to match boundaries of shapefile

I have boundary data in WGS 84 and data in a custom generated CRS. The data in the generated CRS appears to be offset by a particular vector. I want to attempt to match the generated CRS projection ...
2
votes
1answer
240 views

Which coordinate system and projection shall I use for georeferencing google map image in ArcGIS?

I have saved Google Maps image (not Google Earth) of area at latlon(17.692437,83.218689) by some method in jpeg format. It is an exact snapshot of the Google Maps. Now I need to geo-reference it to ...
2
votes
3answers
182 views

How to handle layers with different Spatial references in ArcGIS Runtime SDK WPF?

I am currently writing the "Zoom to Layer" function for my application. However, the spatial references between my imported layer and my base map is different? Is there a way around this? Can I some ...
3
votes
1answer
493 views

Convert GPS coordinate to ArcGIS x,y point?

I'm trying to plot some AGSSimpleMarkerSymbol's in a AGSGraphicsLayer. The issue I'm running into is that the data I'm starting with are GPS coordinates (lat/lon). I'm using AGSPoint to plot the data, ...
9
votes
0answers
464 views

ArcGIS Length and Area Calculation Scenarios

Trying to get a handle on how length and area are calculated in different scenarios in ArcGIS. I don't know why I can't find a answer on the feature class fields, but I can't find a precise answer, ...
1
vote
2answers
215 views

How to calculate the surface using Lambert correction?

i'm using lambert conformal conic , so we have distortions along any given parallel , i would like to get the area used to solve this distortion. I have calculated the area using Shoelace formula , ...
1
vote
1answer
111 views

Taking a 'custom' map and transforming its x/y co-ordinates to 'real' long/lat co-ordinates?

I was wondering if someone could help me out with a little project I'm working on. I'll try to describe what I'm trying to achieve - if it doesn't make sense, please let me know. I have in front of ...
0
votes
1answer
97 views

How do I reproject a arbitrary coordinate system grid to OSGB

I have a polygon grid of a certain shape that has some data associated with it. Unfortunately its not properly projected, being in what seems to be an arbitrary scale and coordinate system (it was ...
2
votes
1answer
475 views

Convert shapefile in NAD27 from meters to decimal degrees to match xy data?

I have a shapefile of a boundary (polygon) that has the following projection: NAD_1927_UTM_Zone_11N Projection: Transverse_Mercator False_Easting: 500000.00000000 False_Northing: ...
1
vote
0answers
105 views

Natural Earth: How to get the position of each country?

I've just split the 1:10m Natural Earth countries into individual JSON files which I plan to render and partially stitch back together using RaphaelJS. The 1:10m map is very big (10mb or so) so ...
1
vote
1answer
270 views

How does ESRI ArcGIS 10 recognize a WMS CRS?

I'm working on a WMS service with Mars data. Currently the GetCapabilities shows <SRS>EPSG:4326</SRS>. I assume ESRI ArcGIS 10 reads this and therefore the WMS has GCS_WGS_1984 as a ...
2
votes
2answers
200 views

How do I set custom spatial reference/coordinate sys to my shapefile

I have a python code which converts JSON text file to a shapefile. I have to set coordinate system to this shapefile created. I do not want to access the .prj file from my computer as this code will ...
1
vote
1answer
164 views

Coordinate systems

Does the Coordinate system of a data frame in ArcMap have to match the coordinate system of at least one of the layers in the table of contents? I have found that if defined it will take on the ...
2
votes
1answer
395 views

How to move SHP to gdb with ArcView license?

What I need to do is move all the files into an mxd to a newly created gdb, chechking prj, and update mxd reference. I have ArcGIS 10 SP4, license ArcView I studied a bit of Python and get familiar ...
0
votes
1answer
3k views

How to convert from UTM Zone 36N Mercator to WGS 84 degrees of lat and long?

I have acquired many coordinates from a points I extracted from polygons. The points are in WGS 84 UTM Zone 36N, and I want to use them on Google Maps. I found out that they use different systems (I ...
1
vote
1answer
169 views

Dynamic defining of transformation type for ISpatialReferenceFactory.CreateGeoTransformation call

Suppose given a point (IPoint) in some coordinate system. Required to transform it to another coordinate system. If both of coordinate systems are predefined, we can use IGeometry2.ProjectEx with ...
2
votes
2answers
447 views

How to set right coordinate system?

I have shapefile (points) which I got from adding xy data in ArcMap from Excel table. I had Latitude/Longitude data. It is area of northern Australia. For example (5 points): Longitude 136.882 ...
3
votes
2answers
224 views

Geographic co-ordinate system displayed as projected

ArcGIS suite of software categorises coordinate systems as either geographic or projected. From what I understand about coordinate systems (and I may be wrong), geographic co-ordinate systems are used ...
1
vote
1answer
178 views

How do you add a WKT specified coordinate system to Arcgis?

I've got a WKT specified coordinate system, how do I add this to ArcGis?
4
votes
3answers
381 views

Defining the appropriate Projected Coordinate System

I am a beginner at ArcGIS and have a technical question. I need to assign a projected coordinate system to my boundary/polygon data in order to calculate square miles. There are many to choose from. ...
4
votes
3answers
3k views

ArcGIS coordinate system

I'm developing some software using ArcGIS API, but the question is rather theoretical, as I just came from Google Maps and have no idea where to start; everything seems to be different including the ...
2
votes
3answers
621 views

extract lat/long from screen when using British National Grid projection

Using ArcGIS 10, is it possible to click anywhere on the map (projected to British National Grid), but return the coordinates in WGS84 lat long? Alternatively, when will Streetview work with OS ...
16
votes
6answers
9k views

How can I define projections for multiple shape files in ArcMap 10 at once?

I have over 100 shape files that don't have .prj file and thus when I bring them into ArcMap they show the coordinate system as unknown. I know all of the shape files coordinate system is GCS WGS ...
3
votes
2answers
403 views

Trying to load this map service from ArcServer.. its on our own system but its not working… or I don't have access

Can anyone see this? http://gis.co.frederick.va.us/ArcGIS/rest/services/TestSDEService/MapServer Spatial reference is.. var initExtent = new esri.geometry.Extent({ "xmin": ...
5
votes
2answers
2k views

Is it possible to change spatial reference (and reproject) feature classes in-place, using ArcMap/GeoProcessing?

We have an Esri based system in production; a complicated data model with a large number of feature classes. We need to migrate the data to another spatial reference. The feature classes have class ...