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Satellite Imagery Resolution Comparison

To illustrate differences in resolution, LAND INFO has posted images of the same area (an airport surrounded by varying land uses) from several different satellite sensors (as well as a scan of a traditional air photo):

In analyzing the different data types, it’s important to keep the end application in mind. For instance the Landsat 7 15m data is not as sharp as either the Spot 10m or IRS-1C 5m data, but the amount of information it contains along with its large area coverage and low price still make it suitable for a number of general-use applications or small-scale mapping projects.

Graphics courtesy of Dr. Philip Cheng, Dr. Thierry Toutin, and Dr. Victor Tom, authors of “Unlocking the Potential for Landsat 7 Data,” and PCI Geomatics.

landsat30m

Landsat 7 30m resolution

landsat15m

Landsat 7 15m resolution

spot20m

Spot 20m resolution

spot10m

Spot 10m resolution

irs

IRS 1C 5m

radarsat

Radarsat 12.5m resolution

ers

ERS 12.5m resolution

airphoto

1:60,000 aerial photo scanned at 300 dpi

Object Based Image Analysis will reduce costs and speed turn-around on your next land-use/land-cover, vegetation, impervious surface or change detection mapping project.
Vector Feature Extraction: accurate extraction of layers such as buildings, hydrology, transportation and other infrastructure.

LAND INFO Can Turn Your Imagery into Valuable Map Information