topic Re: How images are inserted with correct georeferencing while they have no auxiliary files, in ArcGIS Pro Questions

How images are inserted with correct georeferencing while they have no auxiliary files,

JamalNUMAN — Mon, 30 Mar 2020 12:10:06 GMT

How images are inserted with correct georeferencing while they have no auxiliary files,

I observed that images are inserted with correct georeferencing while they have no auxiliary files.

I was assuming that there should be some uxiliary files in order to get images placed in their correct positions

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

JakeSkinner — Mon, 30 Mar 2020 13:40:35 GMT

Hey Jamal,

TIF files can have an internal header that will store the coordinate and projection information.

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

JamalNUMAN — Mon, 30 Mar 2020 17:34:04 GMT

Thanks Jake.

If this is possible for tif format, then why georeferencing an image with tif type still needs auxiliary files in order to get placed in the correct position?

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

DanPatterson_Retired — Mon, 30 Mar 2020 18:16:56 GMT

You missed Jake's point... they "can" have their georeferencing builtin, but some don't, hence your aux files

TIFF files are the best choice for importing into image editing applications and are also a common GIS raster data format. However, they cannot be natively viewed by a web browser. TIFFs also support georeferencing information in GeoTIFF tags or in a separate world file for use as raster data.

some options when exporting them

Write world file	In the same location as the exported map, generate a separate world file that contains georeference information. This allows the exported image to be used as raster data in ArcGIS Pro or other GIS applications.
Write GeoTIFF tags	Add GeoTIFF information directly to the TIF header. This allows the exported image to be used as raster data in ArcGIS Pro or other GIS applications.

There are many other links in the help regarding tiffs depending where they are coming from or how they got there (eg las data) and whether you want to use them as raster data sources etc

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

JamalNUMAN — Mon, 30 Mar 2020 19:18:55 GMT

Not sure, Dan, where can I find an option to get the tif files georeferenced without the need of auxiliary files while exporting!

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

DanPatterson_Retired — Mon, 30 Mar 2020 21:01:53 GMT

raster to other format

in the environments tab, don't build pyramids or statistics

export to tif

delete the tfw and the other files keeping the tif.

open the tif file in a text editor, for the most part it will be binary, but the spatial reference information is inside

If you want it to never create anything other than the tif... you can code the deletion above or use imagery software

Just use the tif

works for me

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

JamalNUMAN — Tue, 31 Mar 2020 08:33:11 GMT

Thanks Dan,

I observed that the world file is embedded in the tiff file. I just deleted all the auxiliary files and found out it is still located in the right place

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

DanPatterson_Retired — Tue, 31 Mar 2020 10:33:46 GMT

Glad I could help!

Re: How images are inserted with correct georeferencing while they have no auxiliary files,

JamalNUMAN — Mon, 03 Jan 2022 18:25:50 GMT

The “Export Raster World File” tool can create world files for the tif tiles and then these tif tiles can be shifted based on a code from python script

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import os
import arcpy
import string

Folder_Path = arcpy.GetParameterAsText(0)

for file in os.listdir(Folder_Path):
if file.endswith(".tfw"):
print(os.path.join(Folder_Path, file))
with open(os.path.join(Folder_Path, file), 'r') as f:
lines = f.readlines()
f.close()

before_last_line = lines[-2]
before_last_line2 = float(before_last_line) - 50000
last_line = lines[-1]
last_line2 = float(last_line) - 500000
lines[-2] = before_last_line2
lines[-1] = last_line2
num_lines = sum(1 for line in open(os.path.join(Folder_Path, file)))
print (num_lines)

for x in range(num_lines):
print( lines[x])

with open( os.path.join(Folder_Path, file),'w') as o :
for x in range(num_lines):
o.write(str(lines[x]) +'\n')
o.close()

for file in os.listdir(Folder_Path):
if file.endswith(".tif"):
print(os.path.join(Folder_Path, file))
arcpy.DefineProjection_management(in_dataset=os.path.join(Folder_Path, file), coor_system="PROJCS['Palestine_1923_Palestine_Grid',GEOGCS['GCS_Palestine_1923',DATUM['D_Palestine_1923',SPHEROID['Clarke_1880_Benoit',6378300.789,293.4663155389802]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Cassini'],PARAMETER['False_Easting',170251.555],PARAMETER['False_Northing',126867.909],PARAMETER['Central_Meridian',35.21208055555556],PARAMETER['Scale_Factor',1.0],PARAMETER['Latitude_Of_Origin',31.73409694444445],UNIT['Meter',1.0]]")

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