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Pixel depth and raster output won't align with the original

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0

The problem

• Need to convert a raster .tif tile (DOWNLOAD) from WGS84 to GDA94 Albers;


• Need to convert its stored pixel info from Float32 to 8 bit UNSIGNED;


• Need to multiply it by 40; and


• Need to set its pixel size to 30x30 metres.

My steps

1 - Project the raster tile to GDA94 Albers, stating "30" as Output cell size: ArcMap -> Project raster tool;

2 - Converted the pixel depth from Float32 to 8-Unsigned: ArcMap -> copy raster tool;

3 - Recalculated the pixel values multiplying by 40: QGIS -> Raster calculator (Syntax = "tile_name" * 40)

My results

As you can see from the picture below, I have sampled some points and retrieved the info from the original tile and compared to my output raster:

After multiplying by 40, the result I SHOULD expect should be equal to the "OrigX40", however, my results are shown in the "New" column and there's a substantial difference.

My tools

I have used a combination of QGIS 3.6 Noosa and ArcMap 10 (no Spatial Analyst extension -> no raster calculator!).

What am I doing wrong?

Thank you all!

qgis raster coordinate-system arcmap raster-calculator

share

asked 2 mins ago

Overlord84Overlord84

63

add a comment | 

0

The problem

• Need to convert a raster .tif tile (DOWNLOAD) from WGS84 to GDA94 Albers;


• Need to convert its stored pixel info from Float32 to 8 bit UNSIGNED;


• Need to multiply it by 40; and


• Need to set its pixel size to 30x30 metres.

My steps

1 - Project the raster tile to GDA94 Albers, stating "30" as Output cell size: ArcMap -> Project raster tool;

2 - Converted the pixel depth from Float32 to 8-Unsigned: ArcMap -> copy raster tool;

3 - Recalculated the pixel values multiplying by 40: QGIS -> Raster calculator (Syntax = "tile_name" * 40)

My results

As you can see from the picture below, I have sampled some points and retrieved the info from the original tile and compared to my output raster:

After multiplying by 40, the result I SHOULD expect should be equal to the "OrigX40", however, my results are shown in the "New" column and there's a substantial difference.

My tools

I have used a combination of QGIS 3.6 Noosa and ArcMap 10 (no Spatial Analyst extension -> no raster calculator!).

What am I doing wrong?

Thank you all!

qgis raster coordinate-system arcmap raster-calculator

share

asked 2 mins ago

Overlord84Overlord84

63

add a comment | 

The problem

• Need to convert a raster .tif tile (DOWNLOAD) from WGS84 to GDA94 Albers;


• Need to convert its stored pixel info from Float32 to 8 bit UNSIGNED;


• Need to multiply it by 40; and


• Need to set its pixel size to 30x30 metres.

My steps

1 - Project the raster tile to GDA94 Albers, stating "30" as Output cell size: ArcMap -> Project raster tool;

2 - Converted the pixel depth from Float32 to 8-Unsigned: ArcMap -> copy raster tool;

3 - Recalculated the pixel values multiplying by 40: QGIS -> Raster calculator (Syntax = "tile_name" * 40)

My results

As you can see from the picture below, I have sampled some points and retrieved the info from the original tile and compared to my output raster:

After multiplying by 40, the result I SHOULD expect should be equal to the "OrigX40", however, my results are shown in the "New" column and there's a substantial difference.

My tools

I have used a combination of QGIS 3.6 Noosa and ArcMap 10 (no Spatial Analyst extension -> no raster calculator!).

What am I doing wrong?

Thank you all!

qgis raster coordinate-system arcmap raster-calculator

share

asked 2 mins ago

Overlord84Overlord84

63

share

asked 2 mins ago

Overlord84Overlord84

63

share

asked 2 mins ago

Overlord84Overlord84

63

asked 2 mins ago

Overlord84Overlord84

63

asked 2 mins ago

Overlord84Overlord84

63