Background Image - Revision history

Davidbrito: /* Import ESRI geo-referenced image in MOHID GIS */

2009-08-13T20:34:00Z

‎Import ESRI geo-referenced image in MOHID GIS

Davidbrito: /* Import ESRI geo-referenced image in MOHID GIS */

2009-08-13T19:24:57Z

‎Import ESRI geo-referenced image in MOHID GIS

Davidbrito: /* Import ESRI geo-referenced image in MOHID GIS */

2009-08-11T17:08:44Z

‎Import ESRI geo-referenced image in MOHID GIS

Davidbrito: /* What it is */

2009-08-11T15:42:32Z

‎What it is

Davidbrito: /* Import ESRI geo-referenced image in MOHID GIS */

2009-08-11T15:41:52Z

‎Import ESRI geo-referenced image in MOHID GIS

Davidbrito at 15:40, 11 August 2009

2009-08-11T15:40:07Z

Davidbrito: /* What it is */

2009-08-11T15:31:08Z

‎What it is

Anatrancoso: creation and import from arcview

2008-12-22T17:37:06Z

creation and import from arcview

Anatrancoso: New page: * Import ESRI geo-referenced image ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the coordinates file (e.g. image.jpgw). This file has:

2008-12-22T17:09:13Z

New page: * Import ESRI geo-referenced image ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the coordinates file (e.g. image.jpgw). This file has:

New page

* Import ESRI geo-referenced image

ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the coordinates file (e.g. image.jpgw). This file has:

@@ Line 12: / Line 12: @@
 ==Import ESRI geo-referenced image in MOHID GIS==
+===Automatic Method===
 ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the "world file" with the coordinates (e.g. image.jpgw):
@@ Line 33: / Line 33: @@
-'''Note:''' If loading the file fails and all that you see is a white image (but in the right place) the problem is the picture resolution is too high for Mohid Gis to load it. Calculations have to made to know pixels/unit distance
+'''Note:''' If loading the file fails and all that you see is a white image (but in the right place) the problem is the picture resolution is too high for Mohid Gis to load it. Reduce its resolution by 50% and change the jpgw doubling pixel/unit distance X and pixel/unit distance X.
-Alternatively to this process you can convert by hand the world file to Mohid GIS img file,
+===Manual Method===
 * WIDTH (HEIGHT) = number of width (height) pixels time pixels/unit distance X (Y). The pixel information of the image can be seen in [http://www.gimp.org/ GIMP], for example.
 * The Y coordinate must be decreased by ''height pixels times pixels/unit distance Y'' to go from Upper Left Corner (ESRI) to Lower Left Corner (Mohid GIS)
 * Write the path to the file in IMAGE_FILE
 * open the .img file created in MOHID GIS as a background image (file type).

← Older revision		Revision as of 19:24, 13 August 2009
Line 33:		Line 33:


−	'''Note:''' If loading the file fails and all that you see is a white image (but in the right place) the problem is the picture resolution is too high for Mohid Gis to load it. ~~Lower the resolution (as an example a resolution of 4085x2554 was the limit for loading). If you~~ have ~~this problem do not resize~~ to ~~this value but do a shorting ratio (proportional~~ to ~~width and height) that produces resolution close (or lower) to his one.~~	+	'''Note:''' If loading the file fails and all that you see is a white image (but in the right place) the problem is the picture resolution is too high for Mohid Gis to load it. Calculations have to made to know pixels/unit distance

← Older revision		Revision as of 17:08, 11 August 2009
Line 31:		Line 31:

	Now, everytime you want to open that background image go to Open->Background Image (type of file) and select the .img file created.		Now, everytime you want to open that background image go to Open->Background Image (type of file) and select the .img file created.
		+
		+
		+	'''Note:''' If loading the file fails and all that you see is a white image (but in the right place) the problem is the picture resolution is too high for Mohid Gis to load it. Lower the resolution (as an example a resolution of 4085x2554 was the limit for loading). If you have this problem do not resize to this value but do a shorting ratio (proportional to width and height) that produces resolution close (or lower) to his one.

@@ Line 3: / Line 3: @@
   IMAGE_FILE                    : C:\temp\389_.jpg  --> Path to the image file
-  X                             : 0                 --> Coordinate X of the Downer Left Corner
+  X                             : 0                 --> Coordinate X of the Lower Left Corner
-  Y                             : 0                 --> Coordinate Y of the Downer Left Corner
+  Y                             : 0                 --> Coordinate Y of the Lower Left Corner
   WIDTH                         : 16008             --> Width in distance units
   HEIGHT                        : 10011             --> Height in distance units

@@ Line 37: / Line 37: @@
 * The Y coordinate must be decreased by ''height pixels times pixels/unit distance Y'' to go from Upper Left Corner (ESRI) to Lower Left Corner (Mohid GIS)
 * Write the path to the file in IMAGE_FILE
+* open the .img file created in MOHID GIS as a background image (file type).

@@ Line 11: / Line 11: @@
   ALPHA_VALUE                   : 1
-==Import ESRI geo-referenced image==
+==Import ESRI geo-referenced image in MOHID GIS==
 ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the "world file" with the coordinates (e.g. image.jpgw):
@@ Line 28: / Line 22: @@
   -70266.15               --> Coordinate Y of Upper Left Corner
-To convert the world file to Mohid GIS img file,
+This are the actions to import geo-referenced images to MOHID GIS
 * WIDTH (HEIGHT) = number of width (height) pixels time pixels/unit distance X (Y). The pixel information of the image can be seen in [http://www.gimp.org/ GIMP], for example.
 * The Y coordinate must be decreased by ''height pixels times pixels/unit distance Y'' to go from Upper Left Corner (ESRI) to Lower Left Corner (Mohid GIS)

← Older revision		Revision as of 17:37, 22 December 2008
Line 1:		Line 1:
−	* Import ESRI geo-~~referenced image~~	+	== What it is==
		+	A background image data item consists of an image and its geo-reference, given in the *.img file:

−	ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the coordinates ~~file~~ (e.g. image.jpgw). ~~This~~ file ~~has~~:	+	IMAGE_FILE : C:\temp\389_.jpg --> Path to the image file
		+	X : 0 --> Coordinate X of the Upper Left Corner
		+	Y : 0 --> Coordinate Y of the Upper Left Corner
		+	WIDTH : 16008 --> Width in distance units
		+	HEIGHT : 10011 --> Height in distance units
		+	MIP_MAPPED : 1
		+	MAINTAIN_RATIO : 1
		+	ALPHA_VALUE : 1
		+
		+
		+	==Import ESRI geo-referenced image==
		+
		+	# Add New Item
		+	# Background Image
		+	# In this new layer, go to Properties (F4, or right-click, or Menu Data Items/Properties)
		+	# Choose image file
		+	# Import ArcView GeoRef
		+
		+	ESRI geo-referenced images are comprised of two files: the image (e.g. image.jpg) and the "world file" with the coordinates (e.g. image.jpgw):
		+
		+	3 --> pixels/unit distance X
		+	0.000000000000
		+	0.000000000000
		+	-3 --> pixels/unit distance Y
		+	-111989.9 --> Coordinate X of Upper Left Corner
		+	-70266.15 --> Coordinate Y of Upper Left Corner
		+
		+	To convert the world file to Mohid GIS img file,
		+	* WIDTH (HEIGHT) = number of width (height) pixels time pixels/unit distance X (Y). The pixel information of the image can be seen in [http://www.gimp.org/ GIMP], for example.
		+	* The Y coordinate must be decreased by ''height pixels times pixels/unit distance Y'' to go from Upper Left Corner (ESRI) to Lower Left Corner (Mohid GIS)