Category Archives: Remote Sensing

Day 5 GAW: Have you discovered the Iowa Geographic Map Server?

By Education, Geography Awareness Week, Imagery, Iowa Geographic Map Server, Observation, Remote Sensing, , , , , , , , , , , , , , ,

The Iowa Geographic Map Server is a gem of historical and contemporary statewide aerial imagery for Iowa from the 1930s to 2021. It also has many other statewide layers including:

  • elevation maps (LiDAR and USGS topographic maps),
  • historical maps (General Land Office survey maps from 1800s, Andreas Atlas, historic topography),
  • land cover maps (historical and contemporary)
  • geology (landforms and bedrock)

Here’s your challenge: Zoom into your city or a place of significance to you and discover how it has changed over the years, look at how the land cover changed, challenge yourself to find as many changes as you can.

Interested in learning more about the Iowa Geographic Map Server? Watch Gregg Hadish’s recent presentation, “Accessing Iowa Map Services in GIS and Web Applications,” for the Iowa Geographic Information Council September 2023 Lunch and Learn professional development series.

Timelapse Tuesday – 37 years of Urban Growth in Ames, Iowa

By #Time Lapse Tuesday, Activity, Landsat Golden Jubilee, Observation, Remote Sensing, , , , , , , , , , , , ,

This week we are exploring urban growth in Ames, Iowa. The red areas are showing areas of vegetation that are primarily agricultural in the larger areas, the neon green areas are short grass and trees, the gray color is urban areas, and blue areas are water.

Timelaspse Video of Ames, Iowa 1984 to 2021 – Summer Landsat Images

As you watch the time lapse video notice several things:

  1. The expansion of Ada Hayden (the large lake in the center right of the image.)
  2. How the agricultural land in the center of the images fills in rapidly with development between 2008 to 2021
  3. The increase in permanent water retention ponds in as the city develops.
  4. Many of the red agricultural parcels along Ioway Creek (the left river) become smaller and more developed through the time series.

Compare an image of north Ames, Iowa from 1987 to 2021 – what other urban growth changes can you spot?

Ames, Iowa – 1987
Ames, Iowa – 2021

Photos from ISU GIS Day 2022

By Activity, Education, Event, IGIC, Imagery, Iowa Geographic Map Server, Landsat, Landsat Golden Jubilee, Map, Remote Sensing, , , , , , , , , , ,

Celebrating 30 years of GIS at ISU today on GIS Day! We also celebrated the 50th anniversary of Landsat and were able to hand out playing cards, refreshments, posters, and other educational materials. This was a great opportunity for our staff in the GIS facility to share the work that they are doing, and teach others about GIS.

Fall Equinox in Northeast Iowa – #Landsat50

By Earth Observation Day, Imagery, Landsat, Landsat Golden Jubilee, Phenology, Remote Sensing, , , , , , , , , , , ,

Happy Fall! Observe the changes across the landscape in seasonal images in Northeast Iowa. Snow, forest, farmland. Can you notice the areas of coniferous trees versus deciduous trees and where there is seasonal farmland compared to pasture areas? Also notice the changes along the Mississippi and Upper Iowa Rivers. Enjoy the changing seasons!

Winter Equinox – 12/13/2021 – Landsat 8 – Bands 5,4,3
Spring Equinox – 03/27/2022- Landsat 9 – Bands 5,4,3
Summer Solstice – 06/23/2022 – Landsat 8 – Band 5,4,3
Fall Equinox – 09/19/2022 – Landsat 9 – Bands 5,4,3

This year we are celebrating 50 years of the Landsat earth observing satellite mission. Landsat data helps us observe changes in our communities and environment over time.

Disaster at Lake Delhi – #Landsat50

By #Time Lapse Tuesday, Environmental Change, Imagery, Landsat, Landsat Golden Jubilee, Outreach, Remote Sensing, USGS, , , , , , , , , , , ,

Well, it’s Water Wednesday. Today’s Landsat highlight is a time lapse video (2007-2017) showing the effect of a 2010 dam breach on the water level of Lake Delhi located in Delaware County in eastern Iowa. Notice the dramatic decrease in water and the exposure of large sandbars and the refilling of the lake as the dam is restored.

This year we are celebrating 50 years of the Landsat earth observing satellite mission. Landsat data helps us observe changes in our communities and environment over time.

Change Over Time – Flooding on the Landscape (NW Iowa)

By Education, Environmental Change, Imagery, Landsat Golden Jubilee, Observation, Remote Sensing, , , , , , , , , , , , , , , , , , , , ,

Use sliders to compare images.

Today’s image shows an area in northwest Iowa between Spencer (Clay County) and Emmetsburg (Palo Alto County). The two images on the left are showing water levels in 1990 (typical year) and 2022 (recovering from a drought) compared to 1993 (heavy flooding) and 2008 (flooding). Notice the swollen streambanks and flooding along water bodies in the right images.

7/6/1990 – Landsat 5
06/21/1993 – Landsat 5
06/29/2022 – Landsat 9
06/14/2008 – Landsat 5

This year we are celebrating 50 years of the Landsat earth observing satellite mission. Landsat data helps us observe changes in our communities and environment over time.

How are you celebrating the Landsat’s Golden Jubilee?

By #Time Lapse Tuesday, Activity, Announcement, Education, Environmental Change, Event, Imagery, Landsat, Landsat Golden Jubilee, NASA, Observation, Outreach, Remote Sensing, Resource, Story Map, USGS, , , , , , , , , , , , , , , , , , , , , ,
This image is from the Camp Landsat website: https://landsat.gsfc.nasa.gov/outreach/camp-landsat/

To celebrate the Landsat Golden Jubilee, consider taking a virtual visit to Camp Landsat! This summer Camp Landsat is celebrating this exciting anniversary with 5 weeks of programming, celebrating the 5 decades of Landsat’s continuous mission. This week the theme is People and Places.

Enjoy and explore many activities from Camp Landsat including:

Graphic from GLOBE Program Website: https://observer.globe.gov/do-globe-observer/challenges/land-cover-challenge-2022

Stay Cool and Keep Observing!