Jump to content

 
Photo

Need help with Creating a Vector Data layer from an Aerial photo

- - - - -

  • Please log in to reply
3 replies to this topic

#1
Tarkin

Tarkin

    Newbie

  • New Member
  • Pip
  • 1 posts
  • United Kingdom

Dear members of this forum,

In order to use a climatological model (SOLWEIG) for the prediction of mean temperature changes due to vegetation, I need to be able to convert a google earth screenshot of a street into a vector layer (Building edges) in ArcGIS. I'm not sure if there is a method available in ArcGIS to draw lines over the underlying aerial photo> Or maybe there is a tool that converts the outlines of the photograph into lines?

I was hoping if anybody could point me in the right direction. Maybe there are some tutorials available for me to look at? Surprisingly, I did not find any exercise like this in the book Getting started with Arcgis.

Thank you in advance for your help,

Kind Regards.

Tarik

#2
Matthew Hampton

Matthew Hampton

    Hall of Fame

  • Moderator
  • PipPipPipPipPipPipPip
  • 1,295 posts
  • Gender:Male
  • Location:Portland, Oregon
  • Interests:Playing in the mountains and rivers.
  • United States

Hi Tarkin,

It's difficult to automate that process however there is software available. You would need the ArcScan extension for ArcGIS, but it might not get you what you want quickly or easily. You would be better off digitizing the lines yourself or searching for vector data from a provider. There are many links online to help you learn how to digitize. Here are a few.


http://www.scribd.co...izing-in-ArcGIS
http://www.s4.brown....rles/lab3r3.pdf

co-cartographic creator of boringmaps.com


#3
Dustin Edge

Dustin Edge

    Contributor

  • Validated Member
  • PipPip
  • 31 posts
  • Australia

Hi Tarik

The manual process is easy...just create a new shapefile and start editing. But I'm guessing you're after some sort of automated process. You're better off going into a photo editing package first and running a few filters to make the edge lines stand out first. But before you do that, create a world file of your image so you dont lose the georeferencing information.
Once you have a sharper image, a program called WinTopo will help with generating the vectors you need.

One word of caution though, the google licensing clearly states that "scraping" information from their imagery is a big no-no, so you might want to ask such questions in a more generic manner....


Kind Regards
Kind Regards,

Dustin


Dustin Edge
Snr GIS Analyst
AECOM Australia

#4
spg

spg

    Contributor

  • Validated Member
  • PipPip
  • 17 posts
  • New Zealand

As you say street and screenshot I assume it is a small area you're looking at?

If it's UK data, Ordnance Survey have the building outlines available in their MasterMap data, however there are various limitations around using that (not least that you will probably have to pay for it).

Otherwise, as said by Dustin, just create a new feature class and digitise it yourself, possibly with some image modification to make it easier.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

-->