0
votes
1answer
52 views

which Coordinate system should I use for 3D analysis?

I am creating 3D surface below the earth's surface using ArcGIS and then I need to find distances to the plane from the surface. Which coordinate system shall I use? 3D interfaces like IProximity3D ...
2
votes
1answer
95 views

Unknown coordinate system warning when programmatically adding layer

I have another interesting question for you. I have data with unknown coordinate system. When I add this data using a standard tool(File->Add Data) in ArcMap, a warning dialog appears. It looks like: ...
2
votes
3answers
408 views

How to calculate Polyline length in kilometres without changing projection from WGS84 (using ArcObjects)?

I have Road (polyline) feature class and I wish to find those roads whose length are greater than 500 kilometre. The feature class projection is in GCS_WGS_1984 and I do not want to change the ...
1
vote
1answer
214 views

Get a spatial reference object by name from a saved string

I am creating an ArcMap 10.2 extension is VS 2012 and C#. I want to give the user the option to select a spatial reference to be applied to a layer - planning to use the Dialog for that. But then, ...
4
votes
1answer
451 views

In ArcObjects, how do I change the spatial reference of a Map (Data Frame) in an existing MXD?

I need to change the spatial reference of an existing MXD programmatically. In ArcMap UI, I would take the following steps: 1) Open the data frame properties and go to the Coordinate System tab; 2) ...
0
votes
0answers
70 views

Dateline wrap issue in ArcObjects / ArcGIS Engine

I am having issues manually creating a polygon that crosses the dateline (long=180). My x coordinate goes from 178, 179, 180, -179, -178, etc. Anyway, can anyone give me some guidance? I am using ...
2
votes
1answer
88 views

Coordinate System correctly renders both decimal Long/Lat and some number in the billions

I am new to ArcObjects and I have been creating an application which will (among other things) be reading data in from a sister program and plotting it on the map.I have found out that I can enter the ...
2
votes
1answer
151 views

Need to convert from ISpatialReference to SpatialReference

I am attempting to write a method in C# that will accept as input, an ESRI.ArcGIS.Geometry.ISpatialReference object and convert it to an ESRI.ArcGIS.Client.Geometry.SpatialReference object. I need ...
3
votes
1answer
345 views

Cannot select a feature using ArcObjects because coordinate systems differ

I'm using ArcMap 10 and Bing Maps Road as base map. Then we have our adding which is programmed using C#. What I'm trying to do is to select a feature (A) that intersects another feature (B, from a ...
1
vote
1answer
239 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
1answer
481 views

Arcobjects: Is my spatial reference Geographic or Projected?

I have the user select a coordinate system with the Spatial Reference Dialog. Is there a simple way to determine if the resulting spatial reference is a Projected or Geographic CS? I would of ...
1
vote
0answers
272 views

Spatial Reference and Area/Length Attributes relationship

I currently allow users to add a shape file in. From the shape file, allow the user to generate a new layer base on the polygons from the shape file's polygon they imported. Generating the new ...
2
votes
3answers
816 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 ...
9
votes
3answers
6k views

How does ArcGIS compute the distance between two points with a non-equidistant projection?

This is a follow-up question to my previous one, Can you suggest some well-written introductory texts about coordinate system projections? Let's assume I'm working with the CH1903 map projection, ...