Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park COLO AA DATA FORM, p.2 AA POINT CODE ________________ IV. VEGETATION STRUCTURE (check maximum cover class in each stratum): Stratum / max. ht. 1-25% cover 26-50% cover 51-75% cover 76-100% cover 35 m 20 m 10 m 6 m 2 m 0.5 m + herbs V. VEGETATION COMPOSITION (list characteristic species and indicate dominant by a “D,” present by a “P,” and rare by “R” in the appropriate strata). SPECIES Canopy layer Sub-canopy layer Shrub layer Herb layer VI. ADDITIONAL COMMENTS (use this space to provide additional comments about vegetation structure or composition) VII. CLASSIFICATION COMMENTS (use this space to provide additional comments about problems or ease in applying the vegetation key at this site, rationale for choice of association if there was doubt, etc. Comments for modifying the key are welcome) 96
USGS-NPS Vegetation Mapping Program Colonial National Historical Park INSTRUCTIONS FOR COLONIAL NATIONAL HISTORICAL PARK VEGETATION MAP ACCURACY ASSESSEMENT This observation point field form was developed for the Mid-Atlantic Vegetation mapping project. Its purpose is to generate record observations at vegetation polygons and compare them to the mapped data. The general procedure you will follow is to navigate to the pre-selected point using a Garmin GPSMap76 or GPSMap76s GPS unit. Try to navigate as close as possible to the pre-selected point. The species list is collected at that point and the 0.5 ha surrounding the point. Comments re: the vegetation within the entire polygon are also recorded on this form. Once at the pre-selected observation point, you will record your location by collecting a waypoint with the GPS unit and record the required data in the order that it appears on the field form. The materials you should have before you begin are 1) plots of the 7.5’ DRG (and photos if helpful) showing the polygon boundaries, but no information about polygon attributes; 2) pre-selected AA point coordinates loaded into your GPS unit; 3) the field key to vegetation types, and 4) vegetation type descriptions. You should also carry a compass. A measure tape may help for distances and heights. Once you have navigated to an observation point, you should closely observe the vegetation within the prescribed data collection area, which in most cases will be a approximated circular 0.5 ha area (radius = ca. 40 m). You can simply pace one or more radii of 40 meters from the point to assist in gauging the extent of the observation area. Keep the observations within the defined polygon and adjust the area surveyed accordingly (i.e. if the polygon is linear or less than 0.5 ha, keep the observation within the polygon) In cases where an observation point falls in an ecotone, or contains two distinctly different vegetation types, describe the type that covers the larger area and provide notes (see section III3) on the second type. In the rare instance where an observation area is equally divided between two vegetation types, you will have to complete observation point field forms for each type. During navigation to and from a point, generally observe the vegetation in the mapped polygon so that you can answer section III2 (see below). Specific Instructions for completing the AA field form: I.1-4. Self explanatory I.5-11. Indicate GPS unit used and record the file name for the location data that you collect. Record the number of points averaged, accuracy, and either UTM or Lat/Long coordinates displayed by the GPS unit. In the event that GPS locational data cannot be obtained, mark your estimated location on a 7.5’ USGS quad or DRG. II.1. Make note of any other environmental characteristics that might assist in interpreting the site. Also use this space to record general information on hydrology, if the site is a wetland. III.1. Use the field key to determine the vegetation type prevalent at the site. III.2. If one or more additional vegetation types occur within the sample site, record them. III.3. To the extent possible, and based on general observations made navigating to and from the point, note whether the prevalent vegetation of the sample site is representative of the larger polygon in which it is located. It is especially important to note instances where the vegetation of the site is an anomaly or local inclusion within the polygon. III.4. Provide a rough estimate of the percentage of the larger polygon that you observed (e.g., 10%, 20%, etc.). or draw the area on your map and include with this form. IV. Check the maximum cover class for each vertical vegetation stratum indicated on the table. The heights in the left column indicate the maximum height of each stratum. The lowest stratum contains all woody plants < 0.5 m tall and all herbaceous plants, regardless of height. V. List species you would consider to be characteristic of the vegetation at the site. These generally include dominant species and less abundant species that are indicative of specific site conditions such as soil chemistry or 97
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Vegetation Classification and Mapping Project Report - USGS

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