Drawn on the Oblique Mercator projection using WGS84 Spheroid at a scale of 1:1,000,000.

Vertex of the false equator occurs at N49 38 50 W007 38 52

I have problem to choose correct one.]]>

The map is a 1km narrow stretch of beach, with about 15 gcps. GDA94 MGA56 AHD

Any ideas?

Thanks]]>

I have been asked to create a world map for a Flat Earther's community but having trouble setting up the projection. Can someone please explain which spheroid I should use?

Cheers,

Steve]]>

Does anyone know where I would enter these parameters? I have tried via

Any help/insight would be greatly appreciated.

Cheers,

Steve

]]>

2. How to convert orthographic projection to UTM ?

Thanks, for help,]]>

Q: How do I scale these files to match? I have tried changing the planar units and elevation units when I import but this doesn't fix it?

]]>

we get DWG drawings on a regular basis that are supposed to be georeferenced. In one particular case I know they are but when I open the DWG in Global Mapper 20 I get a message that the file does not contain projection data and that I should specify the projection system. I am then loading the Luxembourgish Grid Reference EPSG 2169 and I can load the file into GM. However if I try to export that information for use in another tool there will be no georeference and the file won't show up where it is supposed to show up and if it shows up it's all distorted. I am puzzled to say the least and for a while now I have not found any plausible reason or solution. I read somewhere that you need an Autodesk program to be able to use georeferencing with a DWG file. Any ideas or help is highly appreciated !

Kind Regards from Luxembourg.

Georges]]>

As far exported prj file is following:

GEOGCS["GCS_WGS_1984",DATUM["D_WGS84",SPHEROID["WGS84",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

No matter, if I'll change projection (from Geographical to OSGB) of the layer in the project, result is always the same.

In attachment there is the file that have "PROJCS" in the projection file, I wish to get the same with GM.

This is .prj content from attachment:

PROJCS["OSGB_1936_British_National_Grid",GEOGCS["GCS_OSGB 1936",DATUM["D_OSGB_1936",SPHEROID["Airy_1830",6377563.396,299.3249646]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",49],PARAMETER["central_meridian",-2],PARAMETER["scale_factor",0.9996012717],PARAMETER["false_easting",400000],PARAMETER["false_northing",-100000],UNIT["Meter",1]]

As the input I'm using DWG file.

]]>
*“6414
Proj.4: "+proj=aea +lat_1=34 +lat_2=40.5 +lat_0=0 +lon_0=-120 +x_0=0
+y_0=-4000000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"*

*Imagery
Proj.4: "+proj=aea +lat_1=34 +lat_2=40.5 +lat_0=0 +lon_0=-120 +x_0=0
+y_0=-4000000 +ellps=GRS80 +towgs84=-3.2,-5.7,2.8,0,0,0,0 +units=m
+no_defs"*

* *

*The
problem is the +towgs84=-3.2,-5.7,2.8,0,0,0,0 transformation
value is applied when changing the projection from EPSG 6414 to EPSG 3857
that we must do when creating tile map services.”*

Does anyone have any ideas how i can resolve this issue?

]]>

I am having a problem with reference datum Arc 1960. There seems to be another one in Global mapper which is Arc_1960. What is the difference between these two? Which of them is the correct one, there seem to be about 2.4m shift between them. Can any one help please with advising which one is the correct one to use?

Clarence]]>

regards,

Xtov]]>

any ideas how to do this?

I think i need to copy the file BWTA.GSB (which contains the grid of shift Information in binary NTv2-Format) to a certain directory , but how do I make sure that it is used in the transformation process?

Thanks in advance

Jan

]]>
Jan

When using World Imagery I sometimes find that I need to use a different transformation. Usually I have used another popular GIS package to apply the transformation to the basemap before exporting out as a image and importing into GM.

Is it possible to do all this in GM v19.1? I can seem to find a list of transformations to try and I have no idea how to extract the transformation information as a file from the other GIS package to use in GM to correct the imagery.

Any ideas would be welcome.

Cheers,

Steve]]>

and for the output, the origin lattitute 103.5

and then the messsage error comes.

is there any solution?

thx

.

]]>

i have a problem with "Hotine Oblique Mercator B" seems that is insensitive at AZIMUTH ANGLE parameter.

For replicating the problem try this, using coordinate converter:

Input Coordinate:

X=392937.9206

Y=5818466.7383

Input coordinate system:

EPSG 25833

Output coordinate system:

HOTINE OBLIQUE MERCATOR B

DATUM: WGS84

PLANAR UNITS: METERS

CENTER SCALE FACTOR: 1

AZIMUT ANGLE:**XXXXXXXX**

AMIUTH PT 13.421146

ORIGIN LATITUDE 52.504883

FALSE EAST 1000

FALSE NORTH 2000

AZIMUT ANGLE:

AMIUTH PT 13.421146

ORIGIN LATITUDE 52.504883

FALSE EAST 1000

FALSE NORTH 2000

with proj.4

**XXXXXXXX = 5 then X=1087.6814 and Y=2109.5443**

**XXXXXXXX = 30 then X=1033.1709 and Y=2136.3366**

**XXXXXXXX = 45 then X=996.7541 and Y=2140.2763**

**XXXXXXXX = 60 then X=960.5585 and Y=2134.6564**

**XXXXXXXX = -45 then X=1140.2763 and Y=2003.2459**

Many Thanks for attention

Mario

]]>

Thank you in advance-

Daniel]]>

In Switzerland we changed the coordinate system lately. So we have to deal with different systems all the time.

I have vector data with the projection "PROJ_DESC=Swiss Grid / CH1903 / meters PROJ_DATUM=SWISS GRID (CH1903)" and another source with data with the projection "PROJ_DESC=Swiss Grid (LV95) / CH1903+ / meters PROJ_DATUM=SWISS GRID (CH1903+)"

When I load the two sources in the respective projection I get a small shift in the position.

What is Global Mapper doing? It seems that there is a transformation because the x/y-coordinates are totally different in the two sources.

How can you explain the small shift in my case x 0.8m y 0.15m?

Do I oversee something?

Thank you.

Rainer

]]>

I apologize if this question is a repeat of another, but I'm very new to Global Mapper and can't seem to find the right post that addresses the reprojection process that I need to follow. I'm running v19.1.

I received an XYZ text file from a client in the Colorado North 501 NAD27 coordinate system, but the files that our company uses internally are of the UTM13N coordinate system. How can I reproject the client's original file to our internal coordinate system and export the resulting file to an XYZ or LAS file?

Thanks for your help!

]]>

Thanks

]]>

- I have checked the "Save Projection in LAS/jLAZ header" in the export LiDAR dialog

- I have saved in the 1.2, 1.4 and I still can not see the information in 3rd party software (QT Reader).

**The original LAS file has the correct projection information when opened in 3rd party software packages (QT Reader). ]]>

]]>

thanks in advance

]]>

We have terrestrial LiDAR scans of sports stadiums, and are looking to create local relative coordinate systems for each one (us survey ft). For baseball stadiums, we would like the origin 0,0,0 to be the tip of home plate. The x-axis needs to align with the line running from home plate to right field pole, and y-axis going straight through 2nd base. Positive z being up.

Looking for the most effective way of doing this. I'm thinking of just creating a shift using the coordinates of home plate, then applying a rotation until the axis aligns with the features I mentioned above. I'm not really confident/comfortable that this is the best way to do this.

This would be done at quite a few stadiums, so any help would be much appreciated!

Thanks]]>