[PROJ] Point not within available datum shift grids

[Lesparre, Jochem]

Hi list members,

I have a transformation pipeline with a horizontal and a vertical grid shift file. For a point outside both grids, I want the horizontal component to apply a zero shift and the vertical component to return a no data value. I had this working in PROJ 6, but I don't get it working in PROJ 7 or 8. For points outside the vertical grid area, I get: "TRANSFORMATION ERROR: 52 9 0 (point not within available datum shift grids)". Is there a way to get horizontal coordinates outside the vertical grid area without getting a height value? I was thinking that I could create a nodata.tif covering the entire world, but I hope there is a more elegant way to make the PROJ pipeline (see below) for the national CRS of the Netherlands give the results recommended by the national authorities.

Regards, Jochem

cct +proj=pipeline
+step +proj=unitconvert +xy_in=deg +z_in=m +xy_out=rad +z_out=m
+step +proj=axisswap +order=2,1,3,4
+step +proj=vgridshift +grids=nlgeo2018.gtx
+step +proj=push +v_3
+step +proj=set +v_3=43 +omit_inv
+step +proj=cart +ellps=GRS80
+step +proj=helmert +x=-565.7346 +y=-50.4058 +z=-465.2895 +rx=-0.395023 +ry=0.330776 +rz=-1.876073 +s=-4.07242 +convention=coordinate_frame +exact
+step +proj=cart +inv +ellps=bessel
+step +proj=hgridshift +inv +grids=rdcorr2018.gsb,null
+step +proj=sterea +lat_0=52.156160556 +lon_0=5.387638889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel
+step +proj=set +v_3=0 +omit_fwd
+step +proj=pop +v_3


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