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Vince
Vince
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Can you help me out with buildingI need to build a simple Esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey?

I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwaressoftware.

Can you help me out with building a simple Esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey?

I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwares.

I need to build a simple Esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey?

I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some software.

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PolyGeo ♦
PolyGeo ♦
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I'm hoping some projection gurus might be able toCan you help me out with building a simple esriEsri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey. I've?

I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwares.

My current esriEsri prj that isn't scaling correctly is:

Would be appreciative of any help! Thank you!

I'm hoping some projection gurus might be able to help me out with building a simple esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey. I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwares.

My current esri prj that isn't scaling correctly is:

Would be appreciative of any help! Thank you!

Can you help me out with building a simple Esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey?

I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwares.

My current Esri prj that isn't scaling correctly is:

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Summitbri
Summitbri
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WKT construction for local site scaling in x and y

I'm hoping some projection gurus might be able to help me out with building a simple esri compatible proj string to simply represent scaling northing and easting from a point of origin central to a survey. I've been able to work this out fine with a derivedprojcrs and the affine parametric transformation, however that seems to have some compatibility problems with some softwares.

Effectively the .prj should scale as follows:

X’new = (SCALE_FACTOR * (X’old – ORIGIN_X)) + ORIGIN_X
Y’new = (SCALE_FACTOR * (Y’old – ORIGIN_Y)) + ORIGIN_Y

My current esri prj that isn't scaling correctly is:

COMPD_CS["Custom_Transverse_Mercator_with_NAVD88_and_GEOID18",
    PROJCS["Custom_Transverse_Mercator",
        GEOGCS["NAD83",
            DATUM["North_American_Datum_1983",
                SPHEROID["GRS 1980",6378137,298.257223563]],
            PRIMEM["Greenwich",0.0],
            UNIT["Degree",0.0174532925199433]],
        PROJECTION["Transverse_Mercator"],
        PARAMETER["False_Easting",2814946.878],
        PARAMETER["False_Northing",1359674.745],
        PARAMETER["Central_Meridian",-106.14951023],
        PARAMETER["Scale_Factor",1.0004354904],
        PARAMETER["Latitude_Of_Origin",38.81910429],
        UNIT["US survey foot",0.304800609601219]],
    VERT_CS["NAVD88 (GEOID18)",
        VERT_DATUM["North_American_Vertical_Datum_1988 with GEOID18",2005],
        UNIT["US survey foot",0.304800609601219],
        AXIS["Gravity-related height",UP]]]

My test points are as follows:

Name    Latitude    Longitude
1   38.81867707 -106.15170219
2   38.82023696 -106.15255798
3   38.82234018 -106.14698871
4   38.81947480 -106.14686198
0   38.81910429 -106.14951023 (Point of origin)

Input 'Grid' Points (these are the State Plane ESPG 6428 N/E for the lat/lon's above)
Name    Northing    Easting
1   1,359,523.631   2,814,321.258
2   1,360,093.468   2,814,081.516
3   1,360,848.077   2,815,673.670
4   1,359,804.295   2,815,702.344
0   1,359,674.745   2,814,946.878 (point of origin)

Ground scale factor: 1.0004355056

Grid Distance to PoO 
Name    Northing    Easting
1   -151.1140   -625.6200
2   418.7230    -865.3620
3   1173.3320   726.7920
4   129.5500    755.4660
0   0.0000  0.0000


Ground Distance to Pt of Origin
Name    Northing    Easting
1   -151.1798   -625.8925
2   418.9054    -865.7389
3   1173.8430   727.1085
4   129.6064    755.7950
0   0.0000  0.0000

Grid to Ground - Scaled from Point 0
Name    Northing    Easting
1   1,359,523.565   2,814,320.986
2   1,360,093.650   2,814,081.139
3   1,360,848.588   2,815,673.987
4   1,359,804.351   2,815,702.673
0   1,359,674.745   2,814,946.878

However the poor prj above is providing the following scaled points.

Name    Northing    Easting
1   1,359,519.086   2,814,322.049
2   1,360,087.471   2,814,078.121
3   1,360,853.818   2,815,665.613
4   1,359,809.759   2,815,701.766
0   1,359,674.745   2,814,946.878

Would be appreciative of any help! Thank you!