Pengukuran Dasar Telaga menggunakan Alat Perum Gema Untuk Menghasilkan Peta Batimetri di Telaga Winong Yogyakarta

Abstract

Lake Winong is one lake that is not dried on dry season. This lake is located in the Village Kepek, District Saptosari, Gunung Kidul Regency, Special Region Province Yogyakarta. This study was designed to determine the depth or bottom topography of Lake Winong to produce bathymetry maps. Firstly, a survey was conducted to measure the depth with an echosounder instrument. Principally, an echosounder records the time interval required by the emitted sound wave to propagate to the bottom and return, from which the distance or depth (m) can be computed. Secondly, the depth data were interpolated by initially cross-validating the smallest Root Mean Squared Errors (RMSE) of the Inverse Distance Weighting (IDW), kriging, and natural neighbor methods. Each was run with the power values (weight factors) of 0.5, 1, 2, and 3. The results showed that kriging interpolation with a power value of 3 yielded the smallest RMSE, namely 0.005, and the lake observed was -0.2 to -1.8 m deep, with the deepest location found in the middle of the lake.

Estimated Sulfur Dioxide Pollutant Concentrations In Medan City Using Ordinary Kriging and Inverse Distance Weighting Approaches

“…In Ordinary Kriging, the estimation of a variable at a specific point is done by observing similar data in relation to other data points (Rohma, 2022). Interpolation using Inverse Distance Weighted with a proximity-based approach will result in values that are more similar compared to values that are more distant (Febriarta et al, 2020). Spatial interpolation methods such as IDW and OK have been extensively applied in various fields to create spatial distribution maps.…”