On Civiltoday.com, find the definition of 'Tacheometry' from the homepage snippet. Also, identify the primary method used to determine horizontal and vertical distances in Tacheometric Surveying and the initial letters of the specific instrument employed for this technique, as described in the same snippet.
Navigate to the Civiltoday.com homepage. Locate the article snippet for 'Tacheometric Surveying- Methods, Detail Procedures' on the homepage. Extract the definition of Tacheometry from the snippet. Identify the method for obtaining horizontal and vertical distances from the snippet. Identify the initial letters of the instrument used for Tacheometric Surveying from the snippet. State the extracted definition, method, and the initial letters of the instrument.
The definition of Tacheometry is stated as: 'a branch of angular surveying in which the horizontal and vertical distances are obtained by optical means as opposed to the ordinary process of chain and tape.' The method for obtaining horizontal and vertical distances is identified as 'optical means'. The initial letters of the instrument used are identified as 'he'. All information must be sourced directly from the article snippet visible on the Civiltoday.com homepage.