Isotachs

http://www.hpc.ncep.noaa.gov/research/California_major_rains_files/Page266.htm

Isotach maps are maps with lines that show equal wind speeds. This map is displaying four different panels of Isotachs of North America measured at different speeds.

Isobars

http://wettastrono.de/english/wx_unterseiten/isobaren.html

An Isobar is a map that displays lines of equal atmospheric pressure. There are three rules that apply to an Isobar map; Isobar lines never cross or touch, the Isobar lines can only pass through pressures of  +1000 or -1000 and lastly atmospheric pressure is shown in mb (millibars). This map is displaying the atmospheric pressure around and over Europe.

DOQQ

http://www.lacoast.gov/maps/2005doqq/

a DOQQ map is a pixel based image of an aerial photo in which the terrain and the displacements from the camera have been extracted. The image is a combination of a picture and the geometric aspects of a map. This image shows the areas that were impacted by Hurricane Katrina and Rita.

DEM

http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/DEMs

 DEM stands for Digital elevation model. Its digital representation of ground surface topography. This DEM is just a sample of what a DEM would look like.