By Roger M. McCoy PhD
This concise, much-needed advisor takes readers step-by-step via making plans and executing box paintings linked to many differing kinds of distant sensing initiatives. distant sensing texts and learn stories normally specialise in data-analytic innovations whereas providing a dearth of data on methods within the box. against this, this ebook presents transparent ideas for outlining box paintings ambitions, devising a sound sampling plan, discovering destinations utilizing GPS, and choosing and utilizing potent size options for box reflectance spectra and for reports of plants, soils, water, and concrete components. Appendices characteristic pattern box word varieties, an in depth bibliography on complex and really good equipment, and on-line metadata assets.
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Extra info for Field Methods in Remote Sensing
Attention can be given to roads and trails that provide the most efficient access to all locations. 34 FIELD METHODS IN REMOTE SENSING Choice of Coordinate System Most GPS receivers will produce location data in a choice of at least two coordinate systems: latitude–longitude and UTM. There are some advantages to each, but the UTM grid has a strong advantage for personnel moving about in the field. While using the UTM grid, field personnel can determine with each reading the difference from previous readings and see approximately how far they have moved from other sites.
Most software allows point coordinates on a map to be downloaded to a GPS as well as from a GPS to map. Site Characteristics It is often useful to record features that may affect accuracy at the site where a GPS location is recorded. Plan for collecting this information by identifying in advance what the field personnel should look for while taking a GPS location. , landforms and buildings), and nearness of electrical power Finding Locations in the Field 37 lines or radio transmitters. 1) to determine whether a feature is actually obstructing any satellite.
As a minimum, sample units should be no smaller than a 3 × 3 cluster of pixels or a polygon of comparable size for either training sites or accuracy assessment sites. On the other hand, if sample sites are larger than 10–15 pixels, little new information is being added and field time may be wasted. Sample sites containing more pixels add to the amount of field work required at each site. More information is added by having numerous sample sites of up to 10 pixels each in size. 7. The uneven distribution of trees in the figure on the right makes it a poor sample site.