Suyono Suyono
Fakultas Geografi, Universitas Gadjah Mada, Yogyakarta

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Kajian Foto Udara dan Sistem Informasi Geografis untuk Pemetaan Kondisi Peresapan Air Sub DAS Wedi Kabupaten Klaten, Jawa Tengah Agus Anggoro Sigit; Dulbahri Dulbahri; Suyono Suyono
Majalah Geografi Indonesia Vol 24, No 2 (2010): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.377 KB) | DOI: 10.22146/mgi.13343

Abstract

ABSTRACT The study was conducted in Klaten Regency at Wedi Sub Watershed, part of Dengkeng Watershed. The study aimed to: 1) study the interpretation accuracy of black and white Panchromatic Aerial Photograph scaling 1: 50.000 in identifying the soil factor, slope, landuse, vegetation density, and land conversation, related to the influences  toward  water  infiltration  condition  in  the  research  area;  2)  make  the zonation  of  infiltration  capability  and  water  infiltration  condition  based  on  land factors  the  result  of  aerial  photograph  interpretation;  and  3)  study  the  spatial distribution pattern of water infiltration condition in the research area and analyze to the distribution according to spatial. The research method used aerial photograph interpretation with supported by limited survey for field test, by sampling method was stratified sampling. The method of analysis applied spatial analysis by using Geographical Information System (GIS). The result of the study showed that: 1) the level of aerial photograph accuracy for  interpreting  determinate  factors  of  water  infiltration  in  the  research  area  is acceptable each with the accuracy level of: slope 89.47%; soil texture 82.14%; land use 90.16%; vegetation density 88.89%; and land conservation 80.88%. It mean that although the accuracy level achieved had not been included in very good category, the aerial photograph still can be used in this study; 2) the condition of water infiltration in the research area tended to be relative still good,  indicated by the of the land unit in status of ‘critical’ in the width no more than 25% (30.496 km2). The land unit in status of ‘begin to be rather critical’ in the width of 55.692 km2 or 50.97 %; while the remaining 3.154 km2 or 20.62% was in the status of ‘natural normal’ and 22.544 km2 or 20.62% had ‘good’ status; 3) In the research area, the space of land units with the condition of good infiltration had no spatial relevance to the space of land units and the great infiltration capability.
Evaluasi Potensi Erosi Tanah Menggunakan Teknologi Penginderaan Jauh dan Sistem Informasi Geografi di DAS Bodri Hulu Sukristiyanti Sukristiyanti; Hartono Hartono; Suyono Suyono
Majalah Geografi Indonesia Vol 24, No 2 (2010): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1051.399 KB) | DOI: 10.22146/mgi.13351

Abstract

ABSTRAK Erosi tanah menimbulkan dampak negatif baik terhadap lingkungan atau aspek ekonomi. DAS sebagai unit yang tepat untuk mempelajari erosi membuat data penginderaan jauh memiliki peran penting dalam penelitian ini. Kawasan ini diteliti DAS Bodri atas seluas 501,81 km persegi. Beberapa tujuan dalam penelitian ini adalah mengevaluasi potensi erosi tanah dalam skala moderat dengan menggunakan model erosi dan metode kualitatif, dan memvalidasi peta mengakibatkan erosi tanah. Data utama Landsat ETM + gambar direkam pada tanggal 29 Juni 2006 dan data DEM dari RBI (Rupa Bumi Indonesia) peta pada skala 1:25,000. Metode yang digunakan dalam penelitian ini adalah interpretasi visual dari jenis penggunaan lahan dan vegetasi transformasi indeks pada citra Landsat ETM +, kemiringan gradien turunan berdasarkan data DEM, dan analisis spasial untuk mengevaluasi erosi potensial. Hasil penelitian menunjukkan bahwa kedua peta erosi tanah potensial kelas menyerupai mewakili evaluasi mereka di kelas dari 79%. Daerah yang diteliti didominasi oleh kelas ringan potensi erosi tanah dengan nilai pada 0-20 mm / tahun. Tingkat detail data DEM berasal dari peta RBI dan SRTM (Shuttle Radar Topografi Misi) 30 m tidak sama dengan tingkat detail dari peta kelas erosi tanah potensial. Ini berarti bahwa data DEM tidak dapat digunakan sebagai bahan validasi bagi mereka peta. Validasi kepada mereka peta dengan menggunakan data tanah memeriksa menunjukkan bahwa peta erosi tanah kelas potensial yang dihasilkan oleh metode kualitatif yang lebih mencerminkan dari yang lain. Hal ini disebabkan bahwa metode kualitatif lebih banyak variabel yang terlibat.  ABSTRACT Soil erosion causes negative impact either on the environment or economic aspect. Watershed as an appropriate unit to study erosion makes remote sensing data have an essential role in this study. This researched area was upper watershed of Bodri covering an area of 501.81 square km. Some goals in this research were evaluating potential soil erosion in moderate scale by using an erosion model and a qualitative method, and validating the resulted soil erosion maps.The main data were Landsat ETM+ image recorded on 29 June 2006 and DEM data of RBI (Rupa Bumi Indonesia) map at the scale of 1:25,000. Methods used  in this  research  were  visual  interpretation  of landuse  type  and  vegetation index transformation on Landsat ETM+ image, slope gradient derivation based on DEM data, and spatial analysis for evaluating potential soil erosion.Results indicated that both potential soil erosion class maps are resemble in representing   their  evaluation  at  the  grade  of  79%.  The  researched  area  is dominated by light potential soil erosion class with value at 0 – 20 mm/year. The detail  level  of  DEM  data  derived  from  RBI  map  and  SRTM  (Shuttle  Radar Topography  Mission)  30 m is not equal with detail  level of those potential  soil erosion class maps. It means that the DEM data cannot be used as a validation material  for those  maps.  Validation  to those  maps  by using  ground  check  data showed that the potential soil erosion class map resulted by qualitative method is more representative than the other. It is caused that the qualitative method involved more variables.