altitude gps for measuring land area

{"cid":"91193213","title":"Handheld GPS area measure land measurement NF188 device surveying","imgUrl":"https:\/\/img.ismap.com\/nimg\/3e\/4c\/a81b690ac127b7144db171eefb46-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"NOYAFA","Model Number":"NF-188","Minimum Order Quantity":"1PC","Delivery Time":"5-8 work days Specific time need to consult","Certification":"CE","Place of Origin":"China","Payment Terms":"T\/T, Western Union","Supply Ability":"1000pcs per year","Packaging Details":"With Standard Export Packing Ways","Medel Number":"NF-188","Type":"Land Measurement Handheld","Testing mode":"Manual \/ Auto","Positoning Accuracy":"0.5M","Product name":"Handheld GPS Device"}}

{"cid":"91220639","title":"gnss module High Precision GPS RTK Module Land Survey GNSS Module 115200bps rtk module","imgUrl":"https:\/\/img.ismap.com\/nimg\/72\/7a\/a1b82d4b2e26bde7381204f17c52-200x200-1.jpg","attrs":{"Price":"US $2.4 - 11.80\/","Brand Name":"OTW","Model Number":"WT-62-RK","Minimum Order Quantity":"10pcs","Delivery Time":"7-10working days after receiving the payment","Place of Origin":"China","Payment Terms":"T\/T, Western Union","Supply Ability":"Above US$100 Million","Type":"GNSS Module","Brand":"OTW","Operating mode":"GPS+GLONASS+GALILEO+ BDS","Output Mode":"UART+TTL+R232","Baud rate":"4800bps-921600bps,Default115200bps","Voltage":"1.8V to 3.3V","Power consumption":"103mW @1.8V"}}