Mouza Map Digitizing using ArcScan

“Mouza” is a geographic extent using widely in Bangladesh since early 19th century. Generally mouza is required very much at the time of land purchasing or selling. Urban planners and other decision makers often need super imposed mouza maps in digital format for implementing development projects. So the old, hand drawn mouza maps are needed to be digitized in vector format then. ArcScan extension of ArcGIS is a fantastic option to vectorize the Mouza Maps automatically. But the process is not an one tool approach. The whole process is displayed in this slide as much as I could. But I request you to not follow the process blindly. Understand the basics.

1. MOUZA MAP DIGITIZING
Sourav Bhadra
[email protected]

2. M O U Z A M A P D I G I T I Z I N G
“Mouza” is a geographic extent using widely in Bangladesh since early 19
th
century. Generally mouzais
required very much at the time of land purchasing or selling. Urban planners and other decision makers
often need super imposed mouzamaps in digital format for implementing development projects. So the
old, hand drawn mouzamaps are needed to be digitized in vector format then.
ArcScanextension of ArcGIS is a fantastic option to vectorizethe MouzaMaps automatically. But the
process is not an one tool approach. The whole process is displayed in this slide as much as I could. But I
request you to not follow the process blindly. Understand the basics.
Any suggestions will be welcomed. Enjoy.
10/02/2016

3. M O U Z A M A P D I G I T I Z I N G
MouzaMap Collection and Scanning in Full Size
•Atfirstthemouza
mapsareneeded
tobecollected
andscannedin
digitalformatat
bestresolution
possible (by
defaultitwouldbe
.jpg)

4. M O U Z A M A P D I G I T I Z I N G
Conversion of Raster in Grey Scale
•The scanned
imagesaresaved
in.jpgextension
•Itisneededtobe
convertedinto.tif
extension,whichis
agreyscaleformat
•ATIFFformatcan
supportclassified
colorrangeswhich
isverymuch
required for
vectorization
•.imgformatisalso
preferablebythe
way
•Itsuserschoice.

5. M O U Z A M A P D I G I T I Z I N G
Conversion of Raster in Grey Scale
•Rightclickonthe
layerandclickon
“ExportData”

6. M O U Z A M A P D I G I T I Z I N G
Conversion of Raster in Grey Scale
•Exportthe.jpg
intoTIFFextension
indesiredlocation
•Trytodothis
actionsinasame
workplace/folder

7. M O U Z A M A P D I G I T I Z I N G
Conversion of Raster in Grey Scale
•Finditas.tif
extension
•Youcanseethat
thecolorranges
areshowingas
“Stretched”color
ramp
•Butweneedtwo
colorsshowing
Blackorother
darkercolorsas
ForegroundColor
andwhiteorNo
Color as
BackgroundColor
•Thatwhythe
imageisneeded
tobeclassified
intotwoclasses.

8. M O U Z A M A P D I G I T I Z I N G
Reclassify the Color Class
•Gotothe“Layer
Properties”
•Click“Symbology”
•Pick“Classified”
range
•Select“Classes”as
2,whichwillselect
only2classesof
colortobe
represented
•Puttherangeto
177(orcloserto
thisvalue)for
Darker/Foreground
color
•Select“NoColor”
fortheotherclass

9. M O U Z A M A P D I G I T I Z I N G
Reclassify the Color Class
•Thiswillbethe
output
•Thereisnowonly
twoclassesforthe
imagelayer

10. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Tostarteditingof
theworkflowa
“Dummy Layer”
shouldbeincluded
inthesame
workplacewhere
the.tifisstored
•TheDummyLayer
isactuallya
dummyone.This
layerjuststartthe
editingprocess.If
youhaveother
vectorfilesin
workspace,don’t
needtocreatea
dummylayeror
vector

11. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Starteditingthe
DummyLayer
•Open“ArcScan”
•Youareusing
crackofArcGISfor
sure.Socheckthat
theArcScanis
checkedoninthe
Customize >
Extensions
window.
Otherwiseitwon’t
work
•Click “Raster
Cleanup”
•Click “Start
Cleanup”
•Youcancleanthe
rasterimageusing
thistool(i.e.
unnecessary
writeups)

12. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Click “Cell
Selection”
•Click “Select
ConnectedCells…”

13. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Choose
“Foreground”as
tosearchfor
connectedcells
•Enteravaluein
the“Entertotal
area”
•This value
determineshow
manyconnected
cellswillbe
selected. The
defaultvalueis
300.Itcanbe
increased

14. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Clcik “Raster
Cleanup”
•Click “Erase
SelectedCells”
•Thiswoulderase
theconnected
cellsofsimilar
value

15. M O U Z A M A P D I G I T I Z I N G
Clean the Raster Image
•Buttheprocessis
alittlebitlengthy.
•Youhavetoiterate
the process
multipletimes
untilthedesired
outputcomes
•Yes,doingthisin
ArcMapislittlebit
slowandirritating.
•Youcandothis
usingPhotoshop
orACDSeeor
CorelPaintor
other photo
editingsoftwares.
•Butifyoudon’t
wanttoinsult
ArcMap….Bemy
guest.

16. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Selectthelayerto
bescannedinthe
“ArcScan”toolbar

17. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Click
“Vectorization”
and then
“Vectorization
Settings” to
change the
parameters
•Thevectorization
outputdepends
on these
parameters
•Theparameters
couldnotbefixed
foreveryimage
because it
dependsonthe
qualityofyour
image
•Butyoucankeep
the default
parameters

18. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Click
“Vectorization”
and then
“Vectorization
Options”tocheck
alltheoutputsto
berequired
•Themethodhere
should be
“Centerline”
•The “Outline”
checkwouldresult
increatinglinesby
thebothsidesof
rasterline,butyou
don’twantthat
•Check the
“Foreground”and
“Background”
coloriftheseare
ok

19. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•CreateaPolyline
shapefilewhere
the vectorized
outputwillbe
saved

20. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Click “Start
Editing”ofthe
Line

21. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Click
“Vectorization”
•Then click
“Generate
Features”

22. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Select the
TemplateasLine
•Youcancheckona
polygonifyou
wanttheoutput
asineditable
Polygonshapefile
•Butitisbetterto
dothisinpolyline
•Because in
polygononlythe
closinglineswill
createapolygon
•Butthenon-
closinglineswould
notresultin
•Ifyoudothisin
polylineandthen
convertitinto
polygon,youcan
checkeitherall
theoutputsareok
•Butyourwish

23. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Theprocesswill
beshownina
progressbar
•Itwilltakesome
timethough

24. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Thisisthefinal
outputinline
feature

25. M O U Z A M A P D I G I T I Z I N G
VectorizingProcess
•Buteverythingis
convertedinto
vectorlines.
•Thatisatotal
mess!!!!

26. M O U Z A M A P D I G I T I Z I N G
Converting Vector Lines into Polygons
•Thenthelineis
neededtobe
convertedinto
polygon
•ArcToolbox>Data
Management
Tools>Features>
FeaturetoPolygon

27. M O U Z A M A P D I G I T I Z I N G
Converting Vector Lines into Polygons
•Thisistheoutput
•Butthisisanother
mess
•Because the
closinglinesof
letters and
numbersisalso
showingsmaller
polygons
•Youhavetomerge
theextrapolygons
manuallywiththe
mainpolygon

28. M O U Z A M A P D I G I T I Z I N G
Plot ID Detection
•ThentheplotIDs
shouldbeinserted
manually
•Youhaveto
recheckevery
plotsbecause
somelinesmay
notbevectorized

29. M O U Z A M A P D I G I T I Z I N G
•The process is not easy or one click or one tool approach
•Many specialists are still working on automating the whole process
•But until then it could be a better option
•If anything is easier or if there is any mistake in this process, please feel free to comment
•I’ll be really obliged
Thank You
10/02/2016