problem with layers with different geographic dimension

[ٍElham]

Hi
 I use bioclime and landcover layers in Maxent and the error shows that they have different geographic dimension. so I open the asc in word and edit the header to make the layers the same.

ncols         3459

nrows         3320

xllcorner     34.494304000329

yllcorner     12.108194352195

cellsize      0.0083333333333333

NODATA_value  -9999

 now when I run the maxent the new error appear: unexpected end of file.

How can I use layers with different geographic dimension without any error?!

[Alaaeldin Soultan]

You can't use different geographic dimensions, your layers should be aligned with one dimension.

So, you have to clip all your layer using the extent in R or any GIS application

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Alaaeldin Soultan
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MaxPlanck Institute for Ornithology
Am Obstberg 1
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[Jamie M. Kass]

To build on what Alaaeldin said, you'll need to resample one raster to match the cell size of the other (which should align them), then crop one to the other to make sure they have the same extent. You can do this with the resample() and crop() functions in the R package "raster", or with ArcGIS or QGIS. Simply changing the header does not change the data.

Jamie

[ٍElham]

Thanks Alaaeldin and Jamie. I tested the mentioned ways of re-sampling. but none of them work for me.

On Thursday, July 6, 2017 at 10:30:19 PM UTC+4:30, Jamie M. Kass wrote:

To build on what Alaaeldin said, you'll need to resample one raster to match the cell size of the other (which should align them), then crop one to the other to make sure they have the same extent. You can do this with the resample() and crop() functions in the R package "raster", or with ArcGIS or QGIS. Simply changing the header does not change the data.

Jamie

On Tuesday, 4 July 2017 05:50:15 UTC-4, alaaeldeen80 wrote:

You can't use different geographic dimensions, your layers should be aligned with one dimension.

So, you have to clip all your layer using the extent in R or any GIS application

On Sun, Jun 18, 2017 at 3:25 PM, ٍElham <na.eskan...@gmail.com> wrote:

Hi
 I use bioclime and landcover layers in Maxent and the error shows that they have different geographic dimension. so I open the asc in word and edit the header to make the layers the same.

ncols         3459

nrows         3320

xllcorner     34.494304000329

yllcorner     12.108194352195

cellsize      0.0083333333333333

NODATA_value  -9999

 now when I run the maxent the new error appear: unexpected end of file.

How can I use layers with different geographic dimension without any error?!

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[Liu Idarraga Orozco]

I followed the mencioned steps and can solved the problems with my layers. I did the aligned option 2x2 in QGIS and after that I had to edit the header. Note that the NoData sometimes has a differente code in the layers.

My layers after header edit:

ncols        7800
nrows        10200
xllcorner    -95.000000000000
yllcorner    -60.000000000000
cellsize     0.008333333333
NODATA_value  0

and

ncols        7800
nrows        10200
xllcorner    -95.000000000000
yllcorner    -60.000000000000
cellsize     0.008333333333
NODATA_value  -1.6999999999999999388e+308

-- 
Liu Idárraga O.
Estudiante Doctoral
Facultad de Ciencias Naturales y Museo
Universidad Nacional de La Plata
División de Mastozoología
Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"
Av. Angel Gallardo 470
C1405DJR Ciudad Autónoma de Buenos Aires - Argentina
Phone: +5411- 4982 8370/6670 Ext. 209

[Jamie M. Kass]

This is not helpful for us if you do not tell us exactly what you did, which includes the R code. If you don't supply this, no one can help.

[ٍElham]

I did it in QGIS.

I tested the r.resample way and the result was an empty file!
and the second way I tested from raster.....align raster....and a message appear: unable to create output file.

my raster files are in asc format.

[ٍElham]

I do it!!
Thank you all.
I didn't determined the output folder for reference layer! I did it and it worked!

Although I don't know why the reference layer should be aligned?!

[ndimhypervol]

alignRaster doesn't always work as expected, because it is intended for special cases when resample() doesn't work, I think. Resampling is the best option. Glad something eventually worked for you.

Jamie Kass
PhD Candidate, CCNY
cell: 917-602-5787

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[Ra Zoo]

If changes in header (first 4-5 lines), the data changes and it appears just line-line or moves from the boundary. For these problems, do have any further ideas to make the same header? 

On Friday, July 7, 2017 at 2:00:19 AM UTC+8, Jamie M. Kass wrote:

To build on what Alaaeldin said, you'll need to resample one raster to match the cell size of the other (which should align them), then crop one to the other to make sure they have the same extent. You can do this with the resample() and crop() functions in the R package "raster", or with ArcGIS or QGIS. Simply changing the header does not change the data.

Jamie

On Tuesday, 4 July 2017 05:50:15 UTC-4, alaaeldeen80 wrote:

You can't use different geographic dimensions, your layers should be aligned with one dimension.

So, you have to clip all your layer using the extent in R or any GIS application

On Sun, Jun 18, 2017 at 3:25 PM, ٍElham <na.eskan...@gmail.com> wrote:

Hi
 I use bioclime and landcover layers in Maxent and the error shows that they have different geographic dimension. so I open the asc in word and edit the header to make the layers the same.

ncols         3459

nrows         3320

xllcorner     34.494304000329

yllcorner     12.108194352195

cellsize      0.0083333333333333

NODATA_value  -9999

 now when I run the maxent the new error appear: unexpected end of file.

How can I use layers with different geographic dimension without any error?!

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[Laura Patterson]

Hi

Can you briefly explain the steps you use in QGIS?

I am on version 3.6

Thanks!