Blue carbon ecosystems in the Karimunjawa Islands may play a vital role in absorbing and storing the releasing carbon from the Java Sea. The present study investigated mangrove above-ground biomass (AGB) and carbon stock in the Karimunjawa-Kemujan Islands, the largest mangrove area in the Karimunjawa Islands. Taking the aerial photos from an Unmanned Aerial Vehicle combined with Global Navigation Satellite System (GNSS) measurements, we generated Digital Surface Model (DSM) and Digital Terrain Model (DTM) with high accuracy. We calculated mangrove canopy height by subtracting DSM from DTM and then converted it into Lorey’s height. The highest mangrove canopy is located along the coastline facing the sea, ranging from 8 m to 15 m. Stunted mangroves 1 m to 8 m in height are detected mainly in the inner areas. AGBs were calculated using an allometric equation destined for the Southeast and East Asia region. Above-ground carbon biomass is half of AGB. The AGB and carbon biomass of mangroves in the Karimunjawa-Kemujan Islands range from 8 Mg/ha to 328 Mg/ha, and from 4 MgC/ha to 164 MgC/ha, respectively. With a total area of 238.98 ha, the potential above-ground carbon stored in the study area is estimated as 16,555.46 Mg.

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The increasing population population is a problem for the environment. Increased population will increase the amount of consumption and waste generated. Waste Solid (SW) becomes a problem that is not needed properly. SW deliber changes environmental balance that can cause contamination of soil, air and air. The problem of SW in Tegal City becomes a serious problem. TPA located in Muarareja Urban Village, the lease of the land has expired since November 2015. The need to study the determination of the landfill location is an immediate need. By utilizing Geographic Information System (GIS), is an ideal model in determining location based on data overlay method. GIS utilization with physical data analysis and conformity with Spatial Plan (RTRW). Obtained several location options that can be used as an alternative landfill location. Some government locations, 1) Pulosari District, Kab. Pemalang, 2) District Tonjong, Kab. Brebes, 3) Kedungbanteng Sub-district, Tegal Regency.