# Empty proj string when resolving by SRID

**URL:** <https://community.thinkgeo.com/t/empty-proj-string-when-resolving-by-srid/10159>\
**Category:** WPF\
**Created:** [October 7, 2021, 10:09am UTC](https://community.thinkgeo.com/t/empty-proj-string-when-resolving-by-srid/10159 "2021-10-07T10:09:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kev\_French](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/kev_french/32/24951_2.png) [@Kev\_French](https://community.thinkgeo.com/u/Kev_French)\
**Post date:** [October 7, 2021, 10:09am UTC](https://community.thinkgeo.com/t/empty-proj-string-when-resolving-by-srid/10159/1 "2021-10-07T10:09:58Z")

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Hi  
I’m trying to get a PROJ string via “Projection.GetProjStringByEpsgSrid” for srid 7415 but I get an empty string back. Is this because it’s a compound crs? Using latest 12.3.12  
Cheers

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<div class="post-metadata">

**Author:** ![Leo\_Liu](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/leo_liu/32/25689_2.png) [@Leo\_Liu](https://community.thinkgeo.com/u/Leo_Liu)\
**Post date:** [October 14, 2021, 3:16pm UTC](https://community.thinkgeo.com/t/empty-proj-string-when-resolving-by-srid/10159/2 "2021-10-14T15:16:56Z")

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Hi Kev,

GetProjStringByEpsgSrid is kinda out of date, we’ll update it in the near future.

For this case, proj4 string of EPSG 7415 can be found on [https://epsg.io/7415](https://epsg.io/7415). Then we can pass this proj4 string to ProjectionConverter, below is sample code.

```
        string proj7415Str = "+proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel +towgs84=565.417,50.3319,465.552,-0.398957,0.343988,-1.8774,4.0725 +units=m +vunits=m +no_defs";
        ProjectionConverter projectionConverter = new ProjectionConverter(proj7415Str, Projection.GetDecimalDegreesProjString());
        projectionConverter.Open();

        PointShape originalPoint = new PointShape(142892.19, 470783.87);
        PointShape convertedPoint = (PointShape)projectionConverter.ConvertToExternalProjection(originalPoint);

```

Thanks,  
Leo