topic Re: Iterative Zoom to and export to JPG in Python Questions

Iterative Zoom to and export to JPG

AnthonyTimpson2 — Mon, 14 Nov 2011 15:40:12 GMT

Hello,

I have been trying to string together a simple script to read through a Grid.shp, Zoom to each feature, Export that image to a jpg with a world file with a filename based on the Grid index of the iterated row.

i tried to make this with Modelbuilder but it lacks the functionality it seems

I am absolutely green when it comes to python and I would greatly appreciate a nudge in the right direction.

thanks

Re: Iterative Zoom to and export to JPG

JakeSkinner — Sat, 11 Dec 2021 12:12:36 GMT

Hi Anthony,

Here is an example on how to do this. What the script does is iterate through a shapefile called 'Grid' and adjusts the MXDs extent to each feature in the GRID shapefile, and then exports the map to a JPG based on that extent

import arcpy
from arcpy import env
from arcpy import mapping
env.workspace = r"C:\temp\python"

mxd = mapping.MapDocument(r"C:\DATA\Philadelphia.mxd")

fc = "GRID.shp"
count = str(arcpy.GetCount_management(fc))

x = 1

while x < int(count) + 1:
    rows = arcpy.SearchCursor(fc, "OID = " + str(x))
    for row in rows:
        xmin = row.shape.extent.XMin
        ymin = row.shape.extent.YMin
        xmax = row.shape.extent.XMax
        ymax = row.shape.extent.YMax
        df = arcpy.mapping.ListDataFrames(mxd)[0]
        newExtent = df.extent
        newExtent.XMin, newExtent.YMin = xmin, ymin
        newExtent.XMax, newExtent.YMax = xmax, ymax
        df.extent = newExtent
        mapping.ExportToJPEG(mxd, r"C:\temp\python\JPEG_" + str(x) + ".jpg")
        print "successfully printed JPG"
    x += 1

Re: Iterative Zoom to and export to JPG

AnthonyTimpson2 — Mon, 14 Nov 2011 19:49:30 GMT

You Sir are a Steely Eyed Missile man. Thank you!!

Re: Iterative Zoom to and export to JPG

Thiru_P — Fri, 10 Aug 2012 02:17:23 GMT

Thanks Jake, you are a gem. It worked perfectly.

I wanted to Export the JGW world file for JPEGs too so I modified it and it saved many days of manual work. Thumbs up

mapping.ExportToJPEG(mxd, r"C:\temp\Map_" + str(x) + ".jpg", df, df_export_width=2209, df_export_height=1663, world_file=True)

Re: Iterative Zoom to and export to JPG

nathanbush — Tue, 03 Mar 2015 18:53:08 GMT

hi Jake,

I'm also pretty new to Python, but iterating through many polygons within my shapefile and exporting to JPEGs is exactly what I need to do. I've copied your script, but I keep coming up with the attribute error 'Extent' object has no attribute 'Xmin'. My shapefile only has 4 fields (FID, Shape*, Unit, Hectares), am I missing something here?

Any help is good help.

Thanks

Nate

Re: Iterative Zoom to and export to JPG

DarrenWiens2 — Tue, 03 Mar 2015 18:57:30 GMT

In Python, case matters. XMin (a defined property of Extent) is different from Xmin (something unknown). You can see the exact list of valid Extent properties here.

Re: Iterative Zoom to and export to JPG

nathanbush — Tue, 03 Mar 2015 19:15:19 GMT

figures it would be a simple syntax error

Re: Iterative Zoom to and export to JPG

nathanbush — Wed, 04 Mar 2015 13:12:42 GMT

Hi Jake,

Thanks for the script, its almost doing exactly what I want it to do. Thanks Darren for your correction.

I've got the script to run and iterate through each row and produce a JPEG. However, the JPEGs are all blank - just a white space JPEG of 23 KB. I was thinking that the iteration is not allowing Arc to redraw the map and taking a snapshot of a blank dataframe before the orthophoto and polygons had time to draw. I added a "time.sleep" of 20 seconds (didn't work), so I increased to 60 sec (didn't work). I've also tried exporting to PDFs, but same issue.

Any ideas???

Nate

Here's the Script:

import time

import arcpy

from arcpy import env

from arcpy import mapping

mxd = arcpy.mapping.MapDocument(r"N:\Data\My_map.mxd")

df = arcpy.mapping.ListDataFrames(mxd)[0]

fc = r"N:\Data\IWMMunits.shp"

count = str(arcpy.GetCount_management(fc))

x = 0

while x < int(count) + 1:

rows = arcpy.SearchCursor(fc, "FID = " + str(x))

for row in rows:

xmin = row.shape.extent.XMin

ymin = row.shape.extent.YMin

xmax = row.shape.extent.XMax

ymax = row.shape.extent.YMax

filename = row.getValue("Unit_1")

df = arcpy.mapping.ListDataFrames(mxd)[0] @

newExtent = df.extent

newExtent.XMin, newExtent.YMin = xmin, ymin

newExtent.XMax, newExtent.YMax = xmax, ymax

df.extent = newExtent

time.sleep(60)

mapping.ExportToJPEG(mxd,r"N:\Data\Test_JPEGS\{0}.jpg".format(filename))

print "successfully printed JPG"

x += 1

Re: Iterative Zoom to and export to JPG

JakeSkinner — Wed, 04 Mar 2015 13:50:52 GMT

For the 'filename', make sure the name does not contain any spaces, special characters, or begin with a number.

Re: Iterative Zoom to and export to JPG

nathanbush — Wed, 04 Mar 2015 14:58:08 GMT

Jake,

Thanks again for the timely response. I'm still getting blank JPEGs.

I've taken a subset of my data and removed any special characters in the rows within the specified fieldname (Unit1)

The attribute table is simply "FID", "Shape","Unit1", "Hectares", "Shape_Leng", "Shape_Area"

"Unit1" is the field name I want to iterate through and also will be used to name the JPEGs, ex: "CT001GM.jpg"

FID	Shape	Unit1	Hectares	Shape_Leng	Shape_Area
0	Polygon	CT001GM	0	0.084042	-0.000311

import time

import arcpy

from arcpy import env

from arcpy import mapping

env.workspace = r"N:\NWRS\DNR\Coastal_Network"

mxd = arcpy.mapping.MapDocument(r"N:\NWRS\DNR\Coastal_Network\IWMM.mxd")

df = arcpy.mapping.ListDataFrames(mxd)[0]

fc = r"N:\NWRS\DNR\Coastal_Network\Test2.shp"

count = str(arcpy.GetCount_management(fc))

x = 0

while x < int(count) + 1:

rows = arcpy.SearchCursor(fc, "FID = " + str(x))

for row in rows:

xmin = row.shape.extent.XMin

ymin = row.shape.extent.YMin

xmax = row.shape.extent.XMax

ymax = row.shape.extent.YMax

filename = row.getValue("Unit1") # this should be the attribute field name correct?

df = arcpy.mapping.ListDataFrames(mxd)[0]

newExtent = df.extent

newExtent.XMin, newExtent.YMin = xmin, ymin

newExtent.XMax, newExtent.YMax = xmax, ymax

df.extent = newExtent

time.sleep(60)

mapping.ExportToJPEG(mxd,r"N:\NWRS\DNR\Coastal_Network\Test_JPEGS\{0}.jpg".format(filename))

print "successfully printed JPG"

x += 1

Re: Iterative Zoom to and export to JPG

JakeSkinner — Sat, 11 Dec 2021 12:12:38 GMT

Attached is some data you can test with. Extract the zip file to the following location:

C:\temp\python\userdata

Then you can run the code below. It should successfully print out 4 JPGs to the same directory.

import arcpy
from arcpy import env 
from arcpy import mapping 

env.workspace = r"C:\temp\python\userdata"

mxd = arcpy.mapping.MapDocument(r"C:\temp\python\userdata\IWMM.mxd") 
df = arcpy.mapping.ListDataFrames(mxd)[0] 

fc = "GRID.shp"   
count = str(arcpy.GetCount_management(fc)) 

x = 0 
while x < int(count) + 1: 
    rows = arcpy.SearchCursor(fc, "FID = " + str(x))  
    for row in rows: 
        xmin = row.shape.extent.XMin 
        ymin = row.shape.extent.YMin 
        xmax = row.shape.extent.XMax 
        ymax = row.shape.extent.YMax  
        filename = row.getValue("Unit1")
        df = arcpy.mapping.ListDataFrames(mxd)[0] 
        newExtent = df.extent 
        newExtent.XMin, newExtent.YMin = xmin, ymin 
        newExtent.XMax, newExtent.YMax = xmax, ymax 
        df.extent = newExtent 
        mapping.ExportToJPEG(mxd,r"C:\temp\python\userdata\{0}.jpg".format(filename)) 
        print "successfully printed JPG" 
    x += 1

del mxd, row, rows

Re: Iterative Zoom to and export to JPG

nathanbush — Wed, 04 Mar 2015 19:29:31 GMT

Thanks Jake, it worked on my data too!

Is there a way to get the polygons to show up too, since its parcel boundaries - need that displayed as well.

again, thanks for tolerating my neediness.

Re: Iterative Zoom to and export to JPG

JakeSkinner — Wed, 04 Mar 2015 19:51:50 GMT

Just add the parcels to the map, save the MXD and then run the code. The parcels should then be included.

Re: Iterative Zoom to and export to JPG

nathanbush — Wed, 04 Mar 2015 19:59:02 GMT

Right, I didn't save the mxd before I ran the code.

Thanks.