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You may have to use basal area for variable plot cruising and determine if questionable 'borderline' trees are in or out of the plot. You may also have to measure a tree diameter anywhere on the stem and verify the height at which specific diameters occur. This is all easier said than done considering the available tools and technology you are most likely used to.
The SX Blue II GNSS is a palm-sized receiver that delivers real-time, high accuracy performance using GPS/GLONASS satellites and free SBAS corrections. Its battery-powered lightweight design makes it the ideal choice for a variety of mapping apps including GIS, Forestry, Mining, Utilities, Agriculture, Surveying, and Environmental, at a price you can afford.