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
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
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??
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.
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?
@phil_borycens wrote: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 also noticed today that the distances between points from MAPDIST are less than the distances between the same points from DIST:
Command: DIST
Specify first point:
Specify second point or [Multiple points]:
Distance = 1708.56, Angle in XY Plane = 358.077, Angle from XY Plane = 0.000
Delta X = 1707.60, Delta Y = -57.33, Delta Z = 0.00
Command: MAPDIST
Specify first point:
Specify second point:
Distance = 1707.88 (Meter)
Azimuth = 89.994 degrees (forward), 270.006 degrees (reverse)
Delta X = 1707.60, Delta Y = -57.33
I inserted the points by the values of latitudes and longitudes in MAPTRACKCS or with the 'LL. In dwg assigned UTM84-...N.
Is there any explanation for this?
Because he's using a projected coordinate system and drawing on the grid, so the grid distances are shorter than ground.
In options MAPTRACKCS there are grid settings. But I only saw them there.
Is the grid also used in MAPDIST? If so, with what step, where is it regulated?
All this seems strange to me...
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