Plot image and extract error

[Cleber Azevedo]

Hi everybody,

I'm trying to analyze some orthomosaic images from a wheat trial and I'm having some problems with that. Has anyone had this problem and knows how to solve it?

There are some warnings messages (I'm also sharing the print screen)

I got this one when I tried to plot:

Warning messages:

1: In showSRID(uprojargs, format = "PROJ", multiline = "NO") :

  Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

2: In showSRID(uprojargs, format = "PROJ", multiline = "NO"):

And, this one when I'm trying to extract some date:

Warning messages:

1: In proj4string(x) : CRS object has comment, which is lost in output

2: In .local(x, ...) : invalid layer names omitted

3: In showSRID(uprojargs, format = "PROJ", multiline = "NO") :

  Discarded datum Unknown based on Normal Sphere (r=6370997) ellipsoid in CRS definition

Thank You!

[fmatias]

Hi Cleber,

I’ve never had this warning before. It is related with the objects projections that you are using. For instance, maybe your fieldShape has WGS 84 geographic coordinates (EPSG:4326) and your images has ETRS89-extended / LAEA Europe (EPSG:3035) or WGS 84 / UTM zone 32N (EPSG:32632). They should have the same projections otherwise the objects can’t overlayer.

If I got any new information, I’ll let you know. This link talk about that: https://rpubs.com/ranghetti/sptransform-issue

Also, let me know if you figure out.

All the best,

Filipe

[Cleber Azevedo]

Hi Filipe,

I'll take a look at that link and try to solve this problem. I'll share with you everybody in the forum if I have any news.

Thank you!

Cleber

________________________________________________________________________________

Cleber V. G. Azevedo

Eng. Agrônomo 

(19) 99800-5102

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[Eric Wolske]

Hi Cleber,

Did you ever get this resolved? I'm running into the same issues when rotating an imported image. 

Does anyone know how you set the working projection of the shapefile or image in FIELDimageR? I export orthomosaics from Metashape in WGS84 (EPSG:4326) so not really sure why the error function is showing.

Thanks, 

Eric

[Cleber Azevedo]

Hi Eric,

Yes, my problem was exactly the same. I also use Metashape and even exporting EPSG: 4326 the projection was incorrect. I don't know why but it is giving this problem. 

Anyway, I solved this problem by assigning the raster by QGIS, which by the way, also was not seeing the orthomosaic in EPSG: 4326 before assign.

Sorry, I forgot to post this here.

Let me know if it also works for you.

Best,

Cleber