Satellite FAQs

Are the satellites capturing all the time?

Landsat is tasked on a scheduled capture every 16 days over a particular area, however the higher resolution satellites capture at an on-demand basis.

Does weather/cloud affect the imagery?
Cloud affects optical imagery but radar imagery can capture through cloud.
What is the difference between imagery purchased through Geoimage and Google Earth?
Google Earth is responsible for popularising satellite imagery and making it very accessible for home users. When looking to use imagery for any commercial purpose, where you may wish to specify the date of capture, resolution and accuracy, imagery purchased from Geoimage is advised.
How much does satellite imagery cost?
There are two main methods by which imagery is sold; either per area (square kilometres) or per scene. Once Geoimage has defined your area of interest, we can let you know the price of the imagery and/or the number of scenes required to cover the area. To define your area, please supply Geoimage with a GIS polygon, corner coordinates or a Google Earth .kmz file and if you are having difficulty in defining your area, feel free to call Geoimage for some assistance.
I need new capture of my area, can Geoimage provide new imagery?
Yes, we certainly can. Geoimage can schedule a variety of satellites for new capture over your area.
What does the term 'resolution' mean, when talking about satellite imagery?
Resolution often refers to the area represented by each pixel in the image. 60 cm resolution means that each pixel represents a 60 cm x 60 cm on the ground. The resolution is also referred to as the Ground Sample Distance (GSD).
Can I get live satellite images?
No, the optical satellites we use are in a set 'sun-synchronous' polar orbit. The satellites collect imagery as they pass the area of interest and then download the data to a receiving station. The imagery is then made available to Geoimage for processing.
How frequently can you recapture my area?

The best recapture time with any satellite is approximately two days depending on the latitude of the area. Each satellite has various options for repeat captures so please contact Geoimage to find out more information about each specific satellite.

Can you supply imagery anywhere in the world?
Yes, In an area which is traditionally difficult to capture, Geoimage may request a feasibility report from the satellite owner. The feasibility report is an estimate which indicates a proposed capture period based on the historic cloud cover and known competition in the area. Depending on the govenment requirements and agreements, some vendors will put licensing restrictions on the sale of satellite imagery
What is the minimum order size for satellite imagery?
The minimum area per order varies for each satellite. For QuickBird archive for example it is 25 sq kms whilst ALOS is one scene of 1225 sq kms - feel free to contact Geoimage for further assistance
In what format will my imagery be delivered?

Geoimage can deliver imagery in many common digital formats or printed hardcopy. Our standard delivery for image files is ECW format with support files for ESRI or MapInfo.

What makes Geoimage so unique?
Besides having a helpful, friendly team, Geoimage has specialised in sourcing and processing satellite imagery for over 24 years. Geoimage offers Australia's largest range of satellite imagery products so if your area has been captured we can source it for you.
Can we use archive imagery and new imagery to measure change over time?
Geoimage has access to a wide range of archive libraries containing imagery captured as far back as 1972. Subject to being able to accurately register multiple image dates, change in landcover or vegetation can be detected over time. Geoimage can also generate reports on the direction and magnitude of change.

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