Space Technology Computer Summer Camp2000

Environmental Problem Solving Using Computer Applications

Facts about the stations

Each automatic station has an area of influence of 1250 meters. This means that any measurement done within 1250 meters of a station should be the same as the measurement done by the station itself. The total area of the district is 80,000,000 meters squared.

Stations have the ability to collect data at different time intervals. They can be set to collect data every 5 minute or at every 60 minutes or every four hour. Data is transmitted from the stations via cellular phone to a central computer. More data means longer phone calls.

It takes 133 characters (one line of data) to describe with numbers a single measurement episode of all sensors in a station. In computer terms, each character (a letter or a number) requires a byte of information to be represented. Each byte, on the other hand, is made out of eight bits of information. Our cell phones and modem connections can transmit 4800 bits per second. When set to collect data every five minutes, a station collects 288 lines of data in one day. Each line of data has 133 characters (133 bytes or 1064 bits).

The scale of the map of the stations is 1 cm on the paper, equals 105,420(1:105,420) on the ground. One hundred centimeters equals one meter.

To supply power to the stations they can be plugged into an electrical outlet only if they are less than 5,000 meters from the HMDC main building. If they are farther away they will need to use solar panels to supply the electrcity.

Salinity is a good parameter to characterize water at a given spot. Salinity can be measured in parts per thousand (ppt). A salinity measure of 10 ppt means that there is one part of salt for every 1000 parts of solution.

The amount of dissolved oxygen in the water is important to animals and plants that live in the water. Dissolved oxygen is usually measured in parts per million (ppm). A dissolved oxygen concentration of 10 ppm means that in the water there are 10 parts of oxygen for every 1.000.000 parts of solution. Sensitive fish need at least 5 ppm of dissolved oxygen to survive in water.

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