Plane table

Abstract: From Introduction: The work on which this report is based consisted of detailed field and office studies which occupied the greater part of the summer of 1927. During this period mapping was done with plane table and telescopic alidade on a scale of 1 inch to 1,000 feet, and wells, faults, and outcrops within the productive part of the Teapot field were located in detail.

Abstract: From introduction: acknowledgements.-The Forsyth field was examined to collect data upon which to classify the public land included in it with regard to its value as coal land. The geologic mapping was done with the plane table and telescopic alidade, and all locations were tied to land corners.

Abstract: The “electronic total station,” which is now used routinely by engineering surveyors, provides geologists with a remarkable new tool that can accurately measure (±5 mm over 1 km) in a few seconds the position of points relative to the instrument, either as angles and distances or as x, y, and z coordinates in a given reference frame (for example, easterly, northerly, and vertically) and can download its measurements to a portable computer. The speed and accuracy of data collection makes possible not only the construction of geologic maps directly in the field but also the measurement of the attitude of structural features such as layering and lineations, thus dispensing with a relatively inaccurate compass. In addition to providing a more accurate and rapid way of doing routine mapping such as that done previously with an alidade and plane table, the instrument offers the possibility of doing completely new types of mapping, such as measuring the flow directions and velocities in a river by tracking a flo...

Abstract: In the period between 1918 and 1945 military surveys or revision of previous maps were undertaken in the newly established Czechoslovak state. From this period, four sets of military topographic maps can be distinguished. The first set is represented by revised maps of the Third Austrian Military Survey. The revision was conducted between 1921 and 1954 and the map sheets are at scale 1:25 000. The second set is the maps of provisional military survey from 1923 to 1933 at scales 1:10 000 and 1:20 000. They were drawn in the Benes’s normal conformal conic projection and were completed only for a few percents of the state territory. The third set includes maps from 1934–1938, when a definite military survey was carried out. These 1:20 000 maps were completed using the Křovak’s oblique conformal conic projection, covering again only a part of the state territory, in this case almost one tenth of it. Finally, the German maps called “Messtischblatter” (plane table sheets) were created during the German occupation of the Czech lands in the World War II at scale 1:25 000. They were created in the Gauss-Kruger transverse cylindrical projection and covered about 10% of the state territory, mainly in Moravia. All four map sets used the Bessel’s ellipsoid.