Tag Archives: Erica Moylan

Fly Over! SFWMD Current Canal Network Satellite Image

SFWMDCurrentCanalNetworkCurrentSatelliteImage-PDF LARGER IMAGE

Today’s canal map of South Florida is the third I’ve shared. These recently created maps are the work of SFWMD’s Z.(Ken) Chen, Ph.D., GISP, Supervisor, Geospatial Mapping Services Unit, and his very talented team: Lexie Hoffart, Nicole Miller, and Erica Moylan SFWMD’s GIS. 

You can find all of the maps and more at the SFWMD’s “Map Gallery.” It is located at the public facing GIS site (https://www.sfwmd.gov/science-data/gis). Or you may use the following link for direct access to the maps: https://sfwmd.maps.arcgis.com/apps/MinimalGallery/index.html?appid=1facf32f199240b49a326432258c102f SFWMD Current Canal Network with Current Satellite Image (today’s share); SFWMD Current Canal Network with 1940-1953 Historic Images (298linework); SFWMD Current Canal Network with 1940-1953 Historic Images (Simple Version). Also, I provided an easy link at the top of this page to view the map in large format where you can easily save as a PDF on your desktop. 

You may have noticed that I love maps!

Exploring these maps of Dr Chen and Team, in particular,  allows one to fly with out an airplane! I am always surprised by what I see and learn. You may be too! Through knowledge we shall achieve a clean water future. 

The map key’s bright colors display areas where 298 special drainage districts exist. Many go back to 1913 or before and all were designated by the Florida Legislature. Fascinating! How does this all tie in? (http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&URL=0200-0299/0298/0298.html)

Words of Dr Chen satellite map:

  1. Current Satellite Imagery

The satellite images are from Landsat data that are the most recent cloud-free (e.g. <10% cloud coverage) images over our areas of interest. The sensor on Landsat is called TM or Thematic Mapper. Therefore these images are usually called Landsat data or TM data. Because these individual TM images (or scenes) are processed by USGS following a standard Landsat imagery processing process, and exported to a standard imagery format, therefore it was not very technically challenging when we mosaicked or stitched them together. But the mosaicking was a very time-consuming process because imagery processing always requires a lot of computer time (i.e. CPU and GPU intensive) partially due to the fact of large file size of images as well as the nature of imagery processing. During the mosaicking process, we cropped out the black edges of the individual scenes and applied a limited tonal balancing to minimized the tonal contrasts between the individual scenes.

Dr Ken Chen

~Blog Posts: 

Canal Network of SF w/Historic Imagery, Simple Version 1940-53, SFWMD https://wp.me/p3UayJ-b8N

Current Canal Network of SF w/Historic Imagery 1940-1953 Map, SFMWD https://wp.me/p3UayJ-b83