AutoCAD Map 3D

[#1]

When using the mapdist command the measurement is different from the actual line that I create. The map coordinates and the maptrack coordinates match. When I open a older drawing there is not an issue. Did I somehow change the origin of my template.

Any suggestions thanks

Here is sample from the command line

Command: _mapdist
Specify first point:
Specify second point:
Distance = 12.7513 (Foot)
Azimuth = 38 degrees (forward), 218 degrees (reverse)
Delta X = 15.0000, Delta Y = -0.0381

[#2]

DIST calculates the distance between two points in space.
MAPDIST calculates the distance as measured on the earth's surface.

If no coordinate system is assigned to your drawing, DIST and MAPDIST will return the same values. If you assign a coordinate system based on a map projection for your DWG, then you will of course see a difference between the two measurements.

Here is an example. I assigned HARN/WO.OR-S to my drawing, drew a polyline, and measured the distance of that line using DIST, and then MAPDIST. Here are my results:

DIST
Distance = 7.8132

MAPDIST
Distance = 7.7772

I hope this makes sense

[#3]

When drawing lines there is a difference between the line drawn and the mapdist measurement. Is there a way to draw the line so both distances are equal? David Christensen CAD/GIS Technician Marquette Board of Light and Power 2200 Wright St. Marquette, MI 49855 Office: (906) 228-0326 Cell: (906) 361-8237 Fax: (906) 228-0305

[#4]

I am using AutoCAD maps 3d using the geo function to insert a map in the background.

I inserted two geographic points with the following locations:

35.7137N, 14.6553E

35.7730N, 14.7274E

I am using the mapdist function to find the geodetic distance between these two waypoints. The mapdist function returns 11395.8432m, whereas the true distance is 9260m.

Can you please give me an insight in this problem??

[#5]

To add to my previous post, I am using the WORLD MERACTOR -WGS 84 as the GIS co-ordinate system.

[#6]

Hi Matthew:

Thank you for your posts, and especially for letting us know which coordinate system you are using. Rest assured that you are not going crazy, nor are you using the program wrong...

There is a known issue with MAPDIST in the WGS84 datum; distances are not calculated correctly. This is being tracked internally as 1206299. Thank you for bringing it back to our attention.

[#7]

Thanks!

Sent from my iPhone

[#8]

DIST
Distance = 7.8132

MAPDIST
Distance = 7.7772

I hope this makes sense 

No, it doesn't make sense. Why is the geodetic distance shorter?