DRG map

www.tccycling.com/reports/tahoe/stanford-paig...

DRG is short for Digital Raster Graphic. A DRG is a digital representation of a hard copy USGS Standard Series Topo map. DRG's are sometimes created by scanning the original hard copy map and then georeferencing the image so that it has positional coordinates and can be used in mapping applications. They are also refreshed on an annual basis. The above map is of Auburn state recreation area and is a DRG map.

Isopleth Map

www.weathernotebook.org/features/winters.html

An Isopleth map is a map that uses lines or colors to represent similar regional aspects, or areas with equal value of a certain dimension. Those dimensions may include temperature, elevation, rainfall, and so on. This map is of the United States and Canada and shows mean annual snowfall.

Isopach Map

pubs.usgs.gov/.../USGS_3D/ssx_txt/petrol.htm

An isopach is a line on a map drawn through points of equal thickness of a certain unit of area. The above map is from a oil field in Powder River Basin, in Wyoming and Montana. The map shows the amounts of a certain type of Sandstone called Sussex "B".

Isohyet Map

www.irrigation.gov.mm/water/climateandrainfal...

An Isohyet is a line drawn on a map in order to connect points that have equal amounts of rainfall. The maps above show the precipitation of Myanmar in millimeters. The map comes from an irrigation website with conversation about agriculture and cropping in relation to rainfall.

Isotachs

www.spc.noaa.gov/.../thompson/3may99/waf.htm

Isotachs are lines on a map connecting points of equal wind speed. The map above shows the Midwestern to western United States and Southwest Canada with some isotachs and wind speeds written with the isotachs.

Isobar lines

www.weatheronline.co.uk/reports/wxfacts/Isoba...

Isobars represent lines of constant pressure and on surface maps they can represent stational pressure readings reduced to sea level in order to eliminate the effects of the different heights of reporting stations. This surface map shows isobars as well as highs, lows, trough's, and ridge's.

Lidar mapping

coralreefs.wr.usgs.gov/mapping_lidar.html

Lidar mapping is commonly used for acquiring high resolution topographic data that uses airborne laser ranging with light detection. This image is of South Moloka's reef tract which is a reef in the pacific.